What to eat for your health - according to science

25 Jan 2024 · 1 h 3 min

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ZOE Science & Nutrition Podcast - Episode Summary

Episode Title

What to eat for your health - according to science

Episode Description In this episode, host Jonathan Wolf engages in a detailed conversation with Professor Christopher Gardner and Dr. Sarah Berry about the truths and myths surrounding diets and nutrition. They dissect popular dietary fads, discuss misconceptions, and provide actionable advice to promote sustainable health and well-being.

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Key Guests

  • Prof. Christopher Gardner: Professor of Medicine at Stanford University, Director of Nutrition Studies at the Stanford Prevention Research Center.
  • Dr. Sarah Berry: Associate Professor in Nutrition at King’s College London, Chief Scientist at ZOE.

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Timecodes

  • 00:00 - Intro
  • 01:00 - Quick Fire Questions
  • 02:30 - Why do people go on diets?
  • 05:07 - Is it too late to change your diet?
  • 06:28 - How to adopt a better diet lifestyle in the long term
  • 11:06 - What are the worst diets for our health?
  • 16:47 - Scientific evidence vs. supermarket offerings
  • 19:49 - Improving our diet
  • 25:40 - Whole foods and satiety
  • 31:14 - Plant-based vs Mediterranean diet
  • 32:14 - Benefits of fiber
  • 35:50 - Role of fats in a diet
  • 37:03 - Claims of reduced fat foods
  • 39:33 - Comparison: Low carb vs. low fat
  • 45:07 - Dietary revelations for the year
  • 52:15 - Summary
  • 57:39 - Goodbyes/Outro

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Key Concepts and Discussions

  1. Dieting Myths
  2. One-size-fits-all: There is no singular diet that works for everyone. Individual needs and responses vary widely.
  3. Myth of Temporary Fixes: Diets perceived as quick fixes lead to temporary results; sustainable changes require long-term commitment.
  1. Importance of Personalization
  2. Personalization in diet is essential. People's responses to foods can vary drastically, emphasizing the need for tailored nutritional advice.
  1. Whole Foods vs. Processed Foods
  2. Whole foods are beneficial due to their high fiber content and low levels of added sugars and unhealthy fats. Processed foods often lead to quick blood sugar spikes and lack essential nutrients.
  1. Plant-Based Diets
  2. Emphasis on incorporating more plant-based foods is essential for health. This includes grains, beans, and a variety of colorful fruits and vegetables, which provide diverse nutrients and fibers.
  1. Role of Fiber
  2. Fiber is crucial for gut health and overall well-being. It promotes satiety and supports a healthy microbiome.
  1. Fats in Nutrition
  2. Healthy fats from plant sources (e.g., avocados, nuts) are essential and should not be feared. Low-fat diets may lead to increased sugar consumption and lower health outcomes.
  1. Behavioral Aspects of Eating
  2. How we eat (e.g., eating speed, mealtime routines) is as important as what we eat. Practices like time-restricted eating can positively impact health.
  1. Long-Term Health Improvements
  2. Significant health improvements can occur at any age with dietary changes, reinforcing the idea that it's never too late to start.

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Recommendations for Listeners

  • Focus on a whole food, plant-based diet.
  • Aim to reduce animal fat and avoid refined sugars and grains.
  • Incorporate diverse plant foods to enhance gut health.
  • Don’t fear healthy fats; they can be integral to a balanced diet.
  • Change how you eat: consider the speed of eating and timing of meals.

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Final Thoughts The episode underscores the complexity of nutrition while promoting a shift away from restrictive diets towards sustainable, enjoyable eating habits. The consensus among the experts is that improving one's diet is a journey, not a destination, and can lead to significant long-term health benefits.

For personalized diet advice and support, listeners are encouraged to explore ZOE's resources.

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Additional Resources

  • To learn more about the *Daily 30* plant-based supplement mentioned in the episode, visit [ZOE.com](https://zoe.com/podcast) for a special discount.

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Transcript

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0:00Welcome to ZOE Science & Nutrition, where world leading scientists explain how their research can improve your health.

0:16I'm your host, Jonathan Wolfe, co-founder and CEO of Zoe. Each day this week, we've examined the science behind the world's most popular diets. And today we conclude our series and ask the key question, what's the healthiest way to eat? Professor Christopher Gardner has been my guest throughout this series. And today we're also joined by Dr. Sarah Berry, and they'll reveal the answer on this show. Christopher is a professor of medicine at Stanford University and the director of nutrition studies at the prestigious Stanford Prevention Research Center. Sarah is associate professor in nutrition at King's College London and the chief scientist at ZOE.

0:54Both Sarah and Christopher are world-leading researchers on how our diet impacts our health. Ready for the ultimate nutrition takeaway? Let's dive in. Christopher, thank you for joining me and Sarah today. This should be fun. I'm very excited. Why don't we start with a quickfire round of questions. And I think you remember the drill. I do. One word. This is a yes, a no. But for one question, I get maybe a little bit of an opportunity to expand. If you're very good. It's like the prize for professors for managing to keep the rules at the beginning, is then they get a whole sentence at the end. He doesn't let me have a whole sentence.

1:35You're very lucky, Christopher. So, can I improve my health if I change what I eat? Yes. Are some popular diets harmful to your health? Yes. Is there one diet that works for everyone? No. Should men and women eat the same diet? Yes. Is there one food that can drastically improve my health? No. See, that was easy. Right? Oh, yeah. Okay. That was very easy. So now you get a whole sentence. What's the biggest myth about healthy eating that you often hear? The biggest myth is that there is one diet for everyone. If we just could find it, if those scientists would just finish their studies, they'd tell us the one diet we all need.

2:28Well, that almost sounds like an ad for Zoe, So I love that, Christopher. So look, throughout the last week, we've been discussing popular diets in this series of sort of short daily episodes. But before we draw sort of our conclusions from this and hopefully help everybody understand how they can improve the way they eat to improve their health in 2024, I actually want to go right back to the start and ask you this. Why do people go on diets? Oh, great question. They intuitively know that what they're eating has an impact on their health and they're not happy with their health. There's so many people who have health conditions, don't want to be on medications, want to lose some weight.

3:15It's pretty obvious for most of them that it's related or could be related to their diet. And so what are the biggest sort of myths or misunderstandings that people are then suffering from when they decide, hey, I'm going to go on to a diet now to fix my health? So for me, the simplest answer would be, there is a diet that I can do short term that I will eventually get to go off of, and I'll be all set once I master that for now, but then I'll quit. And why is that a myth, Christopher? Well, because for anything to work, it only works as long as you're doing it. So once you go off, the weight comes back on, the cholesterol goes back up, the glucose goes back up in the blood.

4:00So it only works as long as you're doing it. So you have to do it forever if you want it to work for your life. Which is quite a challenging idea, isn't it? It's sort of saying, hey, you've got to make a lifelong change to the way you're eating. And when you think about it like that, it also sounds really scary. There'll be probably people listening to saying, well, you know, I can't do that. So therefore I should just give up. Is it as bad as that? Oh, it's not as bad as that at all. I have a PhD in nutrition science. I'm still changing my diet to this day as I do more studies or learn of a different cultural food attribute that I like.

4:36You should be kind to yourself. You should let yourself experiment. I mean, the beauty of food is, and let's make it either eating or cooking. Let's say you burned this recipe. Oh, you're screwed. You'll never make that recipe again. It burned. No, you burned it. Turn the heat down next time or add a different ingredient or go slower. So the beauty of food is you get a do-over every day you want. I love that. And so I think one of the things that we hear often from people is a concern that it's too late. They've been eating in a particular way for too long. And so they are 40, 50, 60, 70, 80. And therefore, it doesn't matter anymore.

5:18I think about my parents, actually, as I think about this. It doesn't matter anymore because it's all done. And so it doesn't make any sense to change what they eat. Are they right? No, for all these things that are risk factors that clinicians measure. Again, this is blood cholesterol or blood glucose or weight, whatever it is. yeah, you can always enhance your physical abilities and your long-term health no matter what age you approach this. Yeah. And there's some really interesting research, Christopher, that came out a couple of weeks ago, you might be aware of, where they looked at how many extra healthy years people had that went from a very typical UK-US diet to the recommended diet and what they called a longevity diet, which is basically combining all of what's up here in your head and applying it to people's diet.

6:07And they found even when people went on to a longevity diet at the age of 60, they still gained many extra healthy years. And I think that's really encouraging that people should really focus on actually at any time. I can still make a huge difference. Yeah. Very encouraging. It's amazing and incredibly positive, I think. I like to do a little drum roll when announcing something exciting at Zoe. And that really exciting thing is that our plant-based gut supplement, Daily 30, is now available in the US. Daily 30 sold out in the UK when it launched, and now we're expecting it to sell out in the US too.

6:46And I think I know why. Because I use it every day. I love it on my morning yogurt. Not only does it taste delicious, it actually gives me over 30 plants and plenty of fiber, without my having to pop a tasteless probiotic or swirl some suspicious green powder into my water. You know what I'm talking about. Also, unlike so many other supplements, Daily 30 actually delivers. Gut health, digestion, energy. Daily 30's ingredients are designed to improve how you feel, and I feel it daily. Since I started taking it, I've noticed that I often don't need my mid-morning snack, and I feel like I have more energy to take on my busy schedule, and I thought I was doing a good job of eating well beforehand.

7:31Of course, I'm just one person, and I work at Zoe. However, because we're Zoe, we ran a randomized controlled trial as we developed Daily30, and the results blew us away, and they helped us to create the gut supplement we sell today, one that's been constantly refined based on the latest research by the scientists that you often hear talk on this podcast. Oh, and if yogurt's not your thing, I know lots of people who tell me that Daily 30 tastes delicious on eggs, on salads, hummus. My wife likes it on pasta. Many Zoe members tell us it's great on avocado toast too. To get it, head to zoe.com, where right now listeners to the podcast can get 10 % off by applying the code FEEDYOURGUT at checkout.

8:14at zoe.com with the code FEEDYOURGUT at checkout. You could be one of the first in the US to try the gut supplement that's changed my day, and I know it'll change yours too. And so you were talking about this idea that people need to sustain this life, this lifestyle sort of permanently. And so I guess that has implications for the sort of diet that people should be adopting as we're discussing this today? Yeah. You have to like it. You have to enjoy it. So I feel like - Which sounds a bit radical, actually. I'm laughing, but that's because I feel like I grew up with diet culture and I think many people listening to this did.

8:58And the whole idea of diet culture is quite linked to the idea of calorie counting, which we touched on. It's like, you're supposed to suffer in order to try and improve your health, which is also why you can't probably do it forever. But I'm sort of laughing because this idea that you might enjoy your diet feels like the opposite of what I was taught. Yeah. So let me give you one of my favorite new phrases. So after doing many studies, and I'm just going to mock myself here, and I'm sure Sarah could agree. If we're trying to get an answerable question, we'll focus on this one thing. And okay, so isolationist, reductionist, this fiber works.

9:39What's the best source of fiber? Cardboard. We've given you cardboard. It has lowered your cholesterol. Go forth and eat cardboard. I don't want to eat cardboard, but I showed you it lowered your LDL cholesterol. So I've been working with chefs a lot lately. And I've been working with a lot of chefs that are interested in plant-based diets. And Greg Drescher is one of the leaders of the Culinary Institute of America in the U.S., one of the largest cooking schools in the U.S. And he introduced a term to me years ago about unapologetic deliciousness. First, it was craveability, which I really liked.

10:12I thought people are going to like that. But when he said unapologetic deliciousness, I think a lot of people would like to eat that way. But it struck me in a particularly strong way because I remember myself for years apologizing. I found the cardboard. We'll help your LDL. I'm scrunching up my face because I'm sorry that I'm asking you to eat cardboard. But it works. I proved it in an NIH-funded study in a randomized control trial. And I'm sorry it's so painful and restrictive, but it's the truth. Greg Drescher said, you know, we can make anything taste good. We'll make this Mediterranean, Middle Eastern, Latin American, African dish taste great.

10:56It'll be plant-based. It might have some animal-sourced food, but a lot less than you eat in the U.S. But it'll be amazing. I thought, ah, I want to stop apologizing. I want to say this is unapologetically delicious. Because in terms of maintaining something long-term, that's what you want. You don't want to be punished and penalized your whole life. Yeah, I'm a great believer in if a food's too healthy to be enjoyed, it's just not healthy at all. and you know a big problem we have isn't just that we're eating the wrong kind of food it's that we are not adhering to any of the kind of recommendations because like you say that lots of these foods are you know they don't taste great they're very restrictive these kind of diets as well and in the uk less than one percent of people actually follow any kind of healthy eating guidelines.

11:49It's the same in the US. And so there's no point telling people to go on this kind of diet, to eat these kinds of foods if they taste rubbish, because you won't adhere to it long-term. And that's why all of these or many of these diets fail. Sarah, I love that. And I would like to pull you in as a fellow geek here. We run studies. We randomly assign people. And I think a huge problem that people have and their frustration with nutrition is what looks like misinformation in the scientific literature and the media that covers it. One day this one works and the next day it doesn't. And the word that really struck me that you just mentioned is adherence.

12:28And we both go to great pains to have them self-report what they're eating. And that's better than not self-reporting. But at some level, I'm sure some of them feel like they told me to eat this and I better tell them that I did because I'm in the study. And they didn't really eat it. And what we're really missing is the nuance of individual variability and how each person in that study followed it a little differently. And as frustrating as that is, it's kind of fascinating to think of the personalization opportunities there that are always coming up. So we covered a host of popular diets throughout the last six days.

13:10And some of them were really extreme and restrictive, which I think is interesting given this discussion we're having about the challenge of something that's restrictive. So like the carnivore diet or the keto diet, or indeed, I think you were talking about this very low fat vegan diet as well. And then there is calorie counting, which basically says you've got to restrict yourself. The heart of what you're doing is restriction. And then there was the Mediterranean diet, which certainly the way that you were selling it to me, Christopher, tasted, it, you know, I could taste it even as you were talking about it and felt a lot less restrictive.

13:44So I'd love to draw some conclusions about these diets before we then talk about, okay, what do you think is best? So maybe start with what are the worst diets for our health? The worst ones are the ones that are most restrictive and most animal-based, which is the highest sources of saturated fat and the lowest sources of fiber. And why is that? Why do you feel like that's what makes them worse, the restriction and the animal fats? So the restriction, the part is it's hard to maintain. Any restrictive diet is hard to maintain. But of all the things that we can come up with in nutrition where you can actually trace it back to a nutrient, the three easiest ones, so actually let me bring up a third, would be saturated fat for your LDL cholesterol, bad.

14:34Fiber for your microbiome, good. And added sugar and refined grain for excess calories and a poor metabolic effect. So I will say that pretty much all the diets that are out there, and we've just published an American Heart Association overview of popular diets, all of them, even our favorites and our least favorites said less added sugar and less refined grain. Let's have a kumbaya moment. Can we just have a big hug and pat on the back? we have consensus on that point. And in this paper that we just wrote, we tiered the diets in four tiers and the lowest tier, just in terms of matching up with American heart guidelines for being a heart healthy diet, keto, paleo, and Atkins were all in the lowest tier.

15:22Published paper. I think another thing that a lot of people feel is, you know, particularly at this time of year, they feel, you know what, I think I sort of over-indulged in, you know, November and December and I'm waking up in January and I know that that has impacting how I'm feeling. So I know that what I'm eating along with probably other aspects of my lifestyle to do with how much exercise is really affecting my health. And I, and I want to feel better now. Like I really want to feel much better. I want to live many more healthy years in the future. For many people will say, I'd really like to lose some weight because I feel like I can see that this has been sort of, you know, slowly going up.

16:01And so they would like to be able to do something which is going to give them, you know, a fast effect on that. So I think to me, you know, not being a nutritional scientist, there's a lot of logic for that. And so I guess what would you say to people, therefore, as they're thinking about how to change what they eat, given, you know, that's what they want and they don't not want to be told, well, you can wait 10 years before anything happens. Yeah. Well, a lot of the things that we do in diet work in four to eight weeks. If you wanted to change cholesterol, blood glucose, inflammatory markers, microbiome, a lot of things like that can change in just weeks.

16:42We've just published an eight-week study assigning identical twins to vegan or omnivore. And the studies were there at four weeks. And so So a lot of the participants looked at that and said, wow, this is amazing. I didn't really appreciate that it could happen so quickly. And so you're saying, you know, people listen to this. You can really change how you feel and like even markers of your health, you know, things that a doctor could measure in your blood, you know, in just a few months without having to go for like, you know, these sort of extreme ketogenic diets or something like that. So, and I'll get Sarah to chime in here.

17:19So you do get bigger effects the bigger the change that you make. But my worry is the bigger the change that you make, it might be the least likely that you will continue that change. So my personal approach for most people is to think of the worst couple things that you do and just get rid of those and find something to replace them. Or find something that you already do that your nutrition consultant likes and do more of that. Take something more reasonable. But if you really wanted something quick, you could see it if you made a big change. But if you want it to last, it should probably be slower.

17:54Just like weight loss issues. If you see anybody losing weight very rapidly, they're very likely to gain it back. A more healthy thing is a pound a week over a long time will last longer. And I think to focus on one change that is going to have that bigger size impact is really important. And we see in our studies, for example, cholesterol can change in 10 days. After two weeks, you see quite a big difference. After four weeks, it plateaus. And so any dietary change, if you were to go to the doctors and have measures done, you do see that change. What we don't see is obviously externally the change.

18:30And that's the problem. So people may be not realizing, wow, you know, making these changes have really had a big impact internally on my health. Yep. So before talking about what people should eat, which is obviously what they're really interested here, I did want to ask about why there's such a big gap between the scientific evidence that both of you talking about right now on topics like calorie counting and sort of low fat food. And then what we see on the food labels when we go to the grocery store or official guidelines where basically, I looked again this week, you walk in there and everything still says low fat on it unless it says high protein.

19:17And there are calorie labels everywhere. And yet you sort of demolish both these approaches to thinking about how we should eat. Yeah, the communication part is the hardest. So the studies that we do are complicated. They don't really have one simple interpretation. And part of the reason for the labels is the food industry recognizing that they want a little bigger share of the market's stomach, just a piece. I can answer my shareholders if I get that. What's the current thing they just said? Oh, they said that. Okay, I'm gonna add it to the label. And shoppers want something convenient, like, oh, food is confusing.

19:56I'd really love to go into the store and have a simple thing that will help me with my choices. And sadly, it isn't simple. I know they want that help. I know they want it to be straightforward. And the food industry wants to make more money. And it works. Some of that advertising works. And we're just caught in a bind trying to communicate what we find in our studies and make it simple for everyone when it's almost never that simple. Sorry, listeners. Yeah, I think this is the real challenge I find, that we know that foods have thousands of chemicals. We know that these chemicals are packaged in, you know, the structure of the food.

20:37You know, I'm particularly interested in the food matrix, so how the structure of the food modulates the health effects of that food. None of this can be captured on those food labels. But we as nutrition scientists need to make sure that our message is very simple to people, but because of this complexity of food, but also the complexity of how we as individuals process the food, it's just too nuanced to communicate in a food label. And so it's a real challenge that we have, and I don't know how we can tackle this. The answer is just to get people to think more critically. I mean, to actually, I think this is maybe an odd twist, and you wouldn't have seen this coming.

21:17I think food is an opportunity for people to think more effectively, critically in ways that will help them in the rest of their life. I don't understand politics. I don't understand war. I don't understand this other thing. You're not thinking critically. There's more than one side to this argument. So think through this logically, recognize the limitations, recognize the strength, and make the best choice you can today. can actually be very empowering in the long run, but you do have to engage. So I'd love to start to talk about what people should do. So we've sort of said, hey, there's a whole bunch of diets that don't make sense.

21:56And in fact, the whole idea of a diet, something you do for a period of time doesn't make sense. You've got to shift to thinking about like, how am I going to eat for the rest of my life? I'd love to talk some more about therefore what we should eat. And Christopher, you said to me before this recording, the number one thing people say to you is, Doc, what should I eat? So let's maybe sort of make that step. What's the starting point for answering that question? Okay. And I think Sarah's going to be with me on this one. My first answer is, it depends. Absolutely. My next two follow-ups are, please tell me with what and instead of what.

22:33And where are you now? So, you know, if somebody says, I'm really thinking whether I should eat eggs or not. And I say, well, what were you going to have otherwise? And they said, well, I was going to have steel cut oats or eggs. I said, well, I don't know. What were you going to have the eggs with? I said, well, I was going to have sausage and bacon. I said, ah, okay. So I really think you ought to have the steel cut oats instead of that. They said, oh, I didn't mean that. I meant a veggie omelet. I said, oh, veggie omelet, steel cut oats. Yeah, not too bad. Pretty equal. I'm fine with that. Or they said I was going to have a Pop-Tart.

23:11I said, oh my God, have the eggs. God forbid you eat that Pop-Tart, right? And so if you put it in the context of with what and instead of what, they could often answer their own question for you, knowing that part. Yeah. And at Zoe, we often talk about swaps. So it's a simple way of really explaining what you've just, or putting into practice what you've just explained. So we say, okay, this is what you're currently eating that isn't so healthy. This is a healthier swap. So it can be used in the same way because we have to be practical. There's no point recommending either food that people don't like, like we've already said, but also that isn't used in that kind of traditional breakfast setting or snack setting.

23:53This really ties into, there's been a shift in American dietary guidelines. So every five years, they update the dietary guidelines for Americans. And two or three cycles ago, they made sure to talk about shifts. So for many years, American nutrition was about penalizing. Don't eat added sugar. Don't eat saturated fat. Don't eat salt. But they didn't tell them what to eat. And a colleague of mine, David Katz, loves to phrase this. Americans are incredibly clever. Or they will find an unmeasurable number of alternative ways to eat poorly once you ask them to avoid this. Oh, I found another way.

24:31That's poor too. Oh, I found another way. Well, that's poor too. Because we didn't tell them what to eat. It was easier to tell them to avoid that. And I think you touched on this a bit when you were saying that the Mediterranean diet was the one that you were most positive about in terms of the different diets that we've unpacked over the last six days. is what is a good way to eat in 2024? Yeah, and there's different names and different approaches. If I had to ask in the three seconds, I would say whole food, plant-based. And whole food means just not the processed and refined things. So you take the wheat berry and you've turned it into flour for bread.

25:13No, eat the wheat berry. You've taken the brown rice and turned it into white rice. You've taken the soybean and turned it into soy protein isolate and added it to a protein bar. No, no, you should eat the whole soybean. So that's what I mean by whole food. And plant-based means you don't have to be vegan or vegetarian here, but boy, people are eating a lot in the U.S. in particular. We eat more meat than any other country in the world. So you don't have to give up all of that, but give up a lot of it and have a plant-based meal. This is where the Mediterranean sort of grain and bean-based dish, which globally have been staples for many, many years in many cultures, partly because they store easily and they're economically feasible.

26:03Grains and beans are pretty simple food bases to start with, and that's why spices are so important. So get Moroccan spices, Mediterranean, Latin American, Middle Eastern, Asian. Spice them up. And then you can add smaller amounts of fish or poultry or pork, something in smaller amounts of meat. So the chefs that I work with for this unapologetic deliciousness do something called the protein flip, where the base of the meal is grains and beans and veggies. And then meat becomes a condiment or a side dish or just a small portion on top of that. So to me, that's very Mediterranean and has lots of flexibility for enjoying what you're eating.

26:48And in a way that sounds very simple, but I think for a lot of people listening to this, also quite unclear in comparison to diets were based on this idea, you have to remove this thing because it's sort of killing you or causing problems. Or basically everything is about calories. You know, you're measuring your calories. So obviously you're not going to get better unless you reduce your calories because that's what it's about. So maybe if we could take those two parts, one after the other. Why is whole food better than processed food? After all, I chew it all up and it goes in my stomach. I remember discussing this with my children at various points, when it's all messed up, they're like, oh, it's okay.

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27:28It's going to be messed up in your stomach anyway, so you might as well eat it that way. So why is it that we can't have it all nicely processed and prepared by the food manufacturers? We're busy people and we have to have this sort of whole food thing that you just mentioned. Okay. So I'm going to ask Sarah to help me fill in on this because satiety and satiation are huge factors in all this that are harder to study than we think. Yeah. And Christopher means how full you feel, because I know you would want us to give a simple term for that. And so this comes up for me all the time thinking, so one of my favorite authors is Barbara Ruhles, who wrote a book called Volumetrics years ago.

28:07And it was the volume of the food that was filling people up. And the volume tends to be much higher if it's veggies and beans and grains than if it is cheese or meat or dairy. And so eating this very satiating meal so that you get full quicker and stop eating, and that it's longer till your next meal, really helps here. As scientists, this is very hard to study. So I've done a number of studies where I've got diet A and diet B. And what I'd really like to know is after three months in the study, how hungry were you in March? How hungry were you in April? We don't have any metrics like that. All the metrics for this concept of satiety are, I gave you a standardized breakfast at 8 a.m.

28:53It had 600 calories. And two hours later, I had a line from starving to very full and I marked on the line where I was in between. Okay, how does that work for April? I can't tell you for April. I can only tell you two hours after the standardized 600 calorie breakfast. And so it's actually a harder concept to measure than you would think. I mean, you can just qualitatively say, so how hungry were you? And people give quite a varied response. Well, I have some good news for you. I'm ready. In our Zoe app, every week we ask people weekly, not just after each meal, how hungry have you felt this week?

29:30So we will be able to look at people's diets. But we have also collected data in that old-fashioned way, but where they do on a scale say after a meal how hungry they feel. I often think about the health effects of processing also around the idea that you've talked about, like the instead of what. So what's happening is we're removing some of these great nutrients, you know, the fiber, some of these bioactives that we often talk about as nutritionists, so polyphenols. We're adding in the bad nutrients, the salt, the sugar, you know, the refined carbohydrates, the saturated fat. We're eating these foods more quickly.

30:07So not only are they more energy dense, like you say, filling up our tummy, but we're eating them so quickly that that's another reason our fullness signals aren't getting to our brain in time. And, you know, all of this means that we're over-consuming the wrong nutrients. Dare I use the term nutrients? Because I know you, like me, are very food-based rather than nutrient-based. Eating less of the good nutrients and eating in the wrong way as well. Yep. And Kevin Hall's done a nice study like that. Again, they were people who were confined and a lot of control was over this, but had an ultra-processed versus a minimally processed and timed how fast they were getting the calories.

30:47And much to your point, when they're eating the more heavily processed foods, they're eating more calories faster. 50 % difference in the rate at which they ate those calories between the ultra-processed and the unprocessed foods, which led to about 200 calorie difference, I think, over the day. And it was hard for that message to get to the brain in time to stop you. So I think you're saying there's like two effects here. here. One is that the more processed food, I'm just basically going to eat it faster. It may even be designed so that I don't want to stop eating it. So I'm just going to end up consuming more calories.

31:25But there's a second part, which is you're saying the food is just worse for me when it's been really processed, that you're losing a lot of things that now scientists understand are really important to us. And I think Sarah, you mentioned, you know, like the thousands of chemicals in our food, right? Because most people listening to this are like, aren't there like seven vitamins? Isn't that basically what there is in food? Because you see them on the great big labels on breakfast cereal, like, hey, this vitamin and this other one has been added. I've got a colleague named Michaela Kiernan who approached this in a wonderful way.

31:58Pick this thing that you think is not so good in your diet that you'd like to replace and try at least five things to replace it. And if you're going to replace it, replace it with something that is as good or better, as opposed to there's a thing I want to get rid of. I tried an alternative and it wasn't as good. So I didn't do it. And I went back. It takes some time. But once you've put in that time and you've replaced that thing with something as good or better, you have a change for the rest of your life that you made. And that's again, now it's part of your lifestyle. You know where to shop for it.

32:31You know how long it takes to make it. You know what you need ahead of time. And for me, that's why it's important that this is a journey and not an overnight thing. I tried five things. It took me weeks to look for other options. But now that I've got it, I mean, think of everyone who, regardless of what their diet is, if they were pushed, there's three or four things that they know they like that they could get quickly. And so to tell them, don't do that anymore, have this other thing. Oh, the other thing isn't going to be nearly as quick as a convenience. Of course not. Not until you get accustomed to it and then it will replace that and it'll work just as well.

33:08Now you touched on sort of, I think the first part there for what you described, sort of whole food, not processed and how, you know, if this food ends up being really processed, like one, we just digest it really fast and you get these great big blood sugar spikes. And we've talked about some of the negatives on that, I think over the last few days. And then I think Sarah, you're also talking about how you lose a lot of things that are stripped out. Can we talk a bit about the other part. So plant-based, which I think, you know, for some people listening is like, what does that mean? Like plants are things in the garden and why is that a good thing?

33:41And how does that tie in with the Mediterranean diet you talked about before? Sure. Cause the, I mean, some of the key things that we came up with from the reductionist days was high saturated fat versus low saturated fat or fiber being good for you. So plants have fiber. Animal foods don't have fiber. Very few plant foods have saturated fat. All the animal foods have saturated fat. So if you just wanted to start overly simplistically, that's a place to start to include more plants in your diet. And why is the fiber good? Fiber is good for the microbiome. It's the food matrix. It slows the digestion so that the carbohydrates that you are eating that are going to turn into blood glucose appear slowly over time, satiating.

34:30It'll help you feel full sooner. It'll last with you longer. This is something we're really interested in as well, because we know that fiber is like the party food for the microbiome as well. And that's where we see the strongest signal. So we see that the association between fiber and a healthy microbiome is incredibly strong. We know that fiber is one of the single nutrients, and I know, again, we hate to talk about nutrients, that is associated with improved health. And I think that one of the strongest reasons is because of the impact it has on our microbiome, as well as these other mechanisms.

35:06You've done some research as well, haven't you, looking at this? I'd love to hear those results, because I know it's quite a new study that's come out. Yeah. So we've been messing with fiber and fermented food and the microbiome and trying to characterize this. We're actually way behind you. So we look to some of your publications to see what you're coming up with. Because we don't, from my perspective, our lab hasn't generated a list of the top microbes or a list of the different kinds of fiber. So at the moment, we're kind of stuck with, well, since we're not sure, have a variety of fibers because the fibers that are present in wheat versus nuts versus beans are not the same.

35:47And it, again, sorry, but it's complicated. So you can't just pick one fiber for one strain of bacteria that you're trying to look at. The growth or the bloom of one of those bacterial strains has an effect on the rest of the community. But that's what I love about Zoe is how you're after that. You're after the complexity because you can measure the fibers and you can measure the microbes. And this is why we talk about diversity so much, because we know that there's no point just focusing in on one fiber or one aspect of a food, that we have to make sure we have a diversity of all the different bioactives and all the different kinds of fibers.

36:27So Sarah, if someone's thinking about this right now for what that means for them to eat, because it sounds cool, right? I want to support my healthy bacteria and get all those health benefits. But what does that mean if I'm thinking about what I'm eating? What does that imply? So when we talk about a diversity of food, we tend to be wanting people to have a diversity of plant-based foods. So we talk about eating the rainbow. So eating the rainbow means that you're getting lots of different types of polyphenols. Polyphenols are these magical bioactives that are in food that give food their pigment, so their color.

37:02So by getting a whole rainbow food, you're getting different polyphenols, but you're also going to get a variety - I'm guessing my red pop tart, coming back to a previous comment, that's probably not the polyphenols that are colouring it. Am I right in guessing this? I'll use Christopher's terminology. So whole food plant-based are the ones that we want to be encouraging and having a diversity of different plant-based foods because exactly like Christopher said, they have so many different types of fibers. And because we know that different bugs, different bacteria feed on different fibers, we want them all to have a party and we want them all to be growing and all be producing the chemicals that we know have such a wide impact on our health.

37:45And before we move beyond this, I'd love maybe to talk for a minute about the fat side of this, because one of the things that we touched on during the last six days is how many people still basically feel that they're really averse to adding fat into their diet because they were brought up when it was, I think about my own family, you know, I was brought up, there was super low fat diet as I grew up because my father had high cholesterol and he was told by doctors, you know, even before I was born, you need to eat low fat. So I definitely grew up in that environment where I still find in a way, the idea of like pouring oil over my food, which I do a lot now, but it's still like, it still feels like a little naughty, which maybe is one of the things that makes it, I enjoy it.

38:26And Sarah, I know like this is one of your core areas of study for, for the last 25 years, you know, if people were understanding what healthy fats are, and they were also looking to understand what they could add in, what is the latest science saying? Yeah. So, and this is a nice way to tie back to fiber. So plant foods rarely have high saturated fat. So if you're getting an avocado, you're getting fiber. If you're getting nuts, you're getting fiber. Seeds, you're getting fiber. Eating olives, you're getting fiber. So you could get the fiber and the monounsaturated fats. And those were all quite high fat foods that you're describing, even though they weren't actually oils and they weren't maybe what people think of necessarily as fats.

39:07I was listing all foods, plant-based foods that have a fair amount of fat in them, nut butters that you could spread on things. I'm saddened that there's still this perception that, you know, low fat, reduced fat, no fat alternatives are healthier for you. And I see these in the fridges of people that I know are on weight loss diets. And honestly, I just, it worries me that there's still this perception out there that if they have a low fat food, they're going to magically lose weight. And also don't realize that by a food having low, no or reduced something's come out of that food what's gone in to replace that yes because of this low fat stigma very focused on low fat yogurt which happens to be full in the u.s of sugar yeah like they'll have a fruited yogurt yeah this is uh passion fruit or guava or blackberry or passion fruit blackberry guava yogurt and you look and it's full of sugar it's like a sugar delivery system.

40:12It's like, they took out the fat. And this is not healthy for you? They took out the fat because people are afraid the fat is bad for them. And they filled it with sugar, which is probably worse than what they started with. And I think this is a great example of how our knowledge of food and the health effects of food and nutrients is evolving so rapidly. So there was evidence to show that dairy fat was bad for us, that it's high in saturated fat, that maybe a high total fat intake when it comes predominantly from saturated fat is bad for us. We now know from randomized control trials and other evidence that fermented dairy fats, so fat in full fat yogurt, fat in cheese, isn't bad for us.

40:55It doesn't raise our cholesterol. And it's very difficult to keep up with how science is evolving. And this, again, is the challenge. And so I think this is why there's these kind of products out there that's preying on people's ignorance, unfortunately. but also Christopher going back to what I know we've been talking about earlier fat makes food taste great yes it carries the flavor it has that creamy mouthfeel as well and so listening to all of this you could start to say okay so there is one like one diet one way of eating which is the best for everybody like is that the you're really pushing on this one so tell me about that and I know Sarah you're saying earlier we have to mention one of Christopher's fantastic studies exactly around this.

41:43Yeah, so we did a large low-carb versus low-fat study. And the approach we took, I think, was fantastic. I'm very proud of this. We wanted it to be a healthy low-carb and a healthy low-fat. Because when you just say low-carb or low-fat, how low and which foods, I can easily come up with a poor and a better diet that both carry that name and are low in carb or fat. When you put good foods, this is where the personalization thing comes in again. After seeing many studies go back and forth on low-fat and low-carb, we did a study that lasted a year, a weight loss study in 600 people, which is a pretty unusually high number of people.

42:26And the weight loss difference was virtually identical in the two groups after a year. But the most stunning thing for me was how variable the responses were to the two diets. So in both diet groups, somebody lost 60 pounds. In both diet groups, somebody gained 20 pounds on a weight loss study. Oh my God, they gained 20 pounds in a weight loss study. So there were like some people who were put on low carb and put on weight. And there were some people who put on low fat and put on weight and the reverse. And the reverse. And I was not calling out outliers. So what's really fun is we graphed for every one of the 600 people, 300 on each diet.

43:06You know, what was the result for each person? and it was absolute continuum. Somebody lost 60 pounds. Oh, should we do kilos here? No, let's talk pounds. 60 pounds. Somebody lost 55, 50, 45, 40, all the way to the other end of gaining 20. Why? They got the same advice. So how could it be these two diets which were quite different? They were very statistically different in terms of carbon fat. So what's the answer? So the answer is we need to find more areas of personalization. In fact, our study was done to test two of those areas. It was never done to test low-fat versus low-carb. We thought there might be a predisposition that people who are genetically predisposed because of some genetic mutation one way, or the group that was the most insulin-resistant versus insulin-sensitive would help explain some of this.

43:59And the literature supported that that might be an explanation for the variability. Neither of them worked. So, Sarah, what's going on? Well, I just want to say, Christopher, what I love about your study is that if you look at the average change in weight, they're exactly the same between the two groups. And I use this in a lot of my teaching to show that we need to move beyond looking at the average, looking at the mean of the population. And this is what dietary guidelines are based on, the average response to food. and your study really clearly shows that if you look at the average they're exactly the same but if you look at how each individual responds it's hugely different and we see this with our ZOE predict research that we see a 20-fold difference from one person to another in their blood sugar response to exactly the same meal yes so for example we fed people exactly the same breakfast we controlled as many of the other conditions that we know impact your blood sugar response.

44:57So they'd fasted overnight, they'd done no exercise, and we still found this 20-fold difference, which is huge to giving them exactly the same breakfast. And this is what we've been exploring, as you know, with all of our ZOE research, what's causing this? How can we disentangle this given that the food's so complicated, we're so complicated, our biology's complicated, and how we live our life is so complicated. Yep. And you won't know tomorrow, right? Oh, you're going to know the next day. Okay, so you won't have all the answers soon. In the meantime, everybody, if they chose a whole food plant-based diet, some are likely to do better on higher fat and lower carbs, some just the opposite.

45:36That's not bizarre. That should be expected. So for now, they shouldn't just throw up their hands and say, oh, there was no difference on average. I'm going to go have a pint of ice cream because the nutrition scientist can't agree on anything. No, no, no. If you talk to us, we actually agree on a lot of stuff. it's just nuanced. And we are waiting to do some better studies. So you should still eat well today. And we have some basic guidelines, but stay tuned because we have some exciting developments in work. I'm struck just by this conversation is sort of like the logic behind why we do this podcast at all.

46:11We want to make the latest scientific information available for free to anyone who wants to listen. And the reality is food is really complicated and understanding for yourself how to take the way that you eat now and how can you adjust it in a way that's healthy for you and navigate the complexity in the grocery store and how you cook it, given all this complexity about like, is that really a whole food? Is that really processed, not processed? It's hard. And I think this is one of the reasons that we see the level of success that we do for people following their Zoe program is this ability to get this day-by-day guide and help you to understand exactly how these meals really score for you allows you to increase your chance of success because it really helps you navigate something that is complicated.

46:58Before we wrap up, I feel like we focus a lot in a way on this past history of diets, which are about like these particular foods that you put in or not. And I feel like a lot of the focus on the sort of ongoing nutritional science is more about sort of the ways in which we eat. And so I'd love for you to maybe just pick out a couple of the things you know that you're really excited about that I suspect we may be talking more about this this year so Jonathan's being very kind to me here Christopher because my my new passion is all around how we eat and I've been working very hard to convince him that this is something that we should focus on this area and we are now focusing and it's now becoming part of our advice which I'm really proud of and so I'm a great believer in as well as what you eat as well as who you are how you eat is incredibly important and it's something i think we as nutritional scientists haven't thought enough about in the past and so we know from our own research how much sleep you've had impacts your blood glucose blood sugar response the next day we know that time restricted eating is a really simple way to be able to improve your health without changing necessarily what food you have and i don't mean time restricted eating having like a six hour really restrictive window So even having a 12-hour period that you don't eat overnight has incredible health benefits.

48:18And we know this from the big IF study, our big intermittent fasting study that we did. We know that how fast you eat food impacts your health. And we've actually published some research about looking at how people on our Zoe Predicts study who ate fast versus those who ate slowly had different blood sugar responses, different visceral fat, different body mass index as well. and we know that time of day is important so we know that for lots of people having carbohydrates earlier in the day is more healthy for you than having carbohydrates later in the day again it's not the same for everyone but if we can combine all of this i think this is a really simple way that we can also again optimize people's health but allowing people to make some small changes that fit within how they live their life without over worrying about trying to get everything perfect.

49:09So for example, just not snacking after eight at night, trying to put your knife and fork down between each mouthful at the dinner table and, you know, trying to be a bit careful having really refined carbohydrate later in the day and adding some of these in and to the mix as well, I think is really magical way that we can easily improve our health as well. I wonder what your thoughts are on this. Yeah. And the key to that is having large bodies of data over time where you see people doing different things. So I think you're doing some excellent work that's going to lead to some randomized controlled trials where you say, ah, we've got a signal from this data set that we have that this thing makes a big difference.

49:51And it looks very compelling, but we could do a new study to test that one thing. But to get that, that you have to have the ideas. So you're generating your own hypotheses for the future. I agree. This is a fascinating area. And it reminds me of, you know, if you're talking time restricted or those kinds of issues. I often give a lecture where I'll say, you know, how many of you are useless unless you eat breakfast and a whole bunch of people raise their hand? How many of you skip breakfast and have absolutely no problem and you're fine? And the other half raises their hand. What is this thing about breakfast is the most important meal of the day?

50:29People are very different in when they start their breakfast, what they have for breakfast, wins their first eating episode. So we know that's very personalized. And so I would love it if you guys can use big data sets to pull together. Ah, there's some hints at who those people are. And you might want to test it on yourself. And we'll do a study in the future. But you're collecting a very powerfully rich database that will do that from all these citizen scientists that are joining Zoe and providing these data. It is obviously really exciting to be able to properly test these things. And as Sarah knows, I was very nervous before we did the randomized control trial on the ZOE membership because basically there's nowhere to hide, right?

51:14Does this really work if people do this product, start doing the test, get their results, then follow all of this guidance using their app and then retest later? Does it genuinely improve their health? So I was very nervous. And Sarah and Tim both said, well, we're not going to keep doing this unless we test this. That's what you have to do as a scientist. So it was very relieving to see that it works. And I think what is exciting is that, you know, we're continuing to use, you know, all the new data to understand how to improve it. And I do think that it's really exciting to see how much just in the data that we're collecting, how much it seems that some of these other factors, like, you know, for some people, the time of day when they eat and time restricted eating, you can really see these differences in behavior.

51:59So, you know, I think Sarah has convinced me this is pretty exciting. Yeah. And it's just another tool in the toolbox. I think I would really emphasize to people, don't focus on a particular tool. Don't focus just on time-restricted eating or eating rate, or, you know, focus, like you said, on a particular food. We've got so many tools in our toolbox. Let's choose the ones that still bring us joy. And let's put the rusty old ones away that either we don't like or aren't helping our body, put them away. And also choose the ones that are going to have the biggest size impact. So for example, we know that breakfast, for those that have breakfast, that counts for 20 % of our energy.

52:37We know that snacks accounts for most people, 25 % of our energy intake. These are eating events that we generally do in isolation. So they're not dependent on someone else around us. These are really simple ways that we can improve our overall diet just changing our breakfast or just changing our snacks. Right. And this will build on itself. So it's food. You eat food every day. So if you can find some of these changes that, so as you mentioned earlier in our talk today, you can't feel your blood cholesterol. You can't feel your blood glucose on any given moment. But if you have less of a foggy brain, if you have more energy, you're feeling more alert, a lot of those are things that will be impacted by this.

53:18And so as you play with some of these, and you see that this modest change led to you being clear-headed, more articulate, that's empowering. And then you go on to the next one and the next one and the next one and it'll build. So it's a very exciting time. And this is what we ask people as well following the Zoe program and on the method study. We actually ask people how they felt. Now, I've run over 30 randomized controlled clinical trials. I never ask people how they feel. I measure all of these measurements of cholesterol, of glucose. and what was amazing is people felt great so we know people on the Zoe program feel great but actually putting it to the test in a proper randomized control trial people had more energy they had better mood they felt more alert and I found that really quite empowering because always I've only been interested in these blood markers but actually seeing that people are feeling better and so then they're more likely to sustain these changes very exciting that is a brilliant way I think to wrap up because we started with this issue about sustainability and I feel like we've finished with sustainability.

54:21I know that actually I could leave the room and you'd keep talking for the next six hours. We've only scratched the surface. So I reckon Sarah's like, oh no, there were 10 other things I want to talk about. I'm afraid we're going to have to - No, 100. 100 other things. We're going to have to stop now. There are many more times we can do this in the future and I'm going to try and do a summary and we went into quite a few places. So I'm going to do my best. So I think the first thing was we started by saying, basically the whole concept of dieting is broken because the concept of dieting is something you do for a short period of time.

54:52And actually that doesn't work. What you need to think about is what is the way I'm going to eat for the rest of my life. And if I do that amazingly, like no matter how old I am, I can profoundly improve my health, which I think is for me, the number one message. Whenever I discuss this with, with anyone, it's like, it's amazing. The latest science says, It doesn't matter what you've done before, however old you are, whatever, you can make changes now that is going to improve your health, which I just find is just really motivating to do something. The second thing you talked about, which I hadn't heard before, is unapologetic deliciousness, which is a bit hard to say, but a brilliant idea.

55:28It is a mouthful. Which is, you know, the food needs to be something you want to eat and that you can stick with. You therefore need to avoid restriction. Any diet which says, I'm getting rid of all of these things and this is going to be really hard, you're not going to be able to sustain. So it needs to be something about adding in a lot of good things into your diet rather than about taking everything away. I think very strong agreement that people need to lower the amount of animal fat that they're eating. If they're eating anything like the typical Western diet, be it in the US or the UK or France, wherever that might be.

56:05and as importantly we need to reduce the number of sort of poor quality carbohydrates and so that's anything where you're adding sugar to the food but also i think the thing that is less obvious for most people you know what you technically call refined grains this is stuff where it's all being there's no longer like the original seed or grain and it's become you know white flour in our bread or white rice which i was brought up to think was really healthy and that almost everyone agreed you want to have more fiber in your diet, in part because of all this new science about how this supports your good bacteria and has these positive impacts.

56:41And I think Christopher, you talked about, if I was going to make this really simple, it was almost like two things. So one was whole food and not processed. And what you're explaining is that the processing does, I think, two bad things. One is it smashes all of this stuff up so that when you're eating this processed carbohydrate, basically your body turns into blood sugar almost immediately. And that causes all of these problems that we've talked about over the last few days and can lead towards diabetes and whatever. But also the processing tends to strip things out. And basically you're removing lots of the healthiest bits.

57:19And therefore whole food is sort of like before you've taken all this stuff away and you keep processing, unfortunately is what we tend to get given a lot of. And the other part is plant-based. And you're very clear, it doesn't mean you have to be vegan or you have to be vegetarian, but you're moving towards a diet where unlike really, I guess, what I grew up with, which is like a big piece of meat in the middle and a little bit around the side, suddenly, you know, if the meat is on the plate, it's like a small bit on the side and it doesn't have to be in every meal either. And then I think Sarah was explaining when you think about plant as well.

57:54You really want this diversity of plants because it's giving you all of these different fibers. And Chris, we were talking about one of your studies, and we see this as well, all the different fibers are supporting all the different bacteria. So sort of whole foods and plant-based is your core. And then we talked a little bit about don't be scared of fats. Many of us were brought up to be scared of fats, but Sarah, again, she'll talk for an hour about how good many healthy fats can be. And it's really, these are these sort of plant-based fats. And you talked about avocados and olives and olive oil and nuts and so long.

58:29And then I think towards the end, we talked really about personalization. The idea there isn't just like one size fits all. You did this brilliant study called diet fits. And it turned out you could go to these two extremes of like low fat or low carb. And on each of them, some people would do really well and some people would do really badly. And Sarah, you talked about our own studies showing, well, it sort of makes sense because you can see like a 20 fold difference in how people's blood sugar responds and how people's blood fat responds. So it sort of makes sense that there isn't just one answer for everybody.

59:02And I think we wrapped up by saying, you know, I think there is quite a lot of consensus, therefore, about key things that people should change. There's also a lot of exciting new science coming, which is early about new ways of thinking about eating. And Sarah, I think you mentioned, for example, time-restricted eating, when you eat, sleeping, all of these things potentially having a lot of effect on your health and just starting to be studied. And, you know, probably keep watching here because hopefully there'll be some exciting new studies that we can report back on in the future. Fantastic.

59:34Great wrap-up. Great. And foods to be enjoyed. That's the most important. And listeners, be kind to yourself. It's a journey. Enjoy the journey. I think that's a brilliant way to wrap up. Thank you very much, Christopher and Sarah. Thank you. I hope that you learned a lot on today's show about the best and worst diet and about what to eat for your health. Now, if listening to this episode has motivated you to change how you eat to improve your health, then you may want to do what I do, which is use Zoe's app every day for personalized advice and personalized support on how I can eat the best foods for me.

1:00:12To learn more about how Zoe can help you to feel better now and live healthier in the years to come, simply go to zoe.com slash podcast right now. You can also get 10 % off your membership. As always, I'm your host, Jonathan Wolfe. Zoe Science and Nutrition is produced by Yellow Hewins Martin, Richard Willen, and Tilly Fulford. The Zoe Science and Nutrition podcast is not medical advice. It's for general informational purposes only. See you next time.

1:00:48As you can imagine, hosting this podcast, running Zoe, juggling family life, it all keeps me pretty busy. So I try as best I can to stay energized and show up well in all those parts my life, by fueling my body with the right food, by exercising, and by adding a scoop of Daily 30 to my meals every day. If you haven't heard of Daily 30 yet, it's the gut supplement designed by our gut health scientists here at Zoe. It's made of over 30 high-quality, hand-picked plants, including seaweed, fungi, and different types of fiber. Better yet, it contains ingredients that support gut health, digestion, and energy, which is ideal for packed calendars and busy lives.

1:01:31Simply add one scoop a day to any meal for an extra boost of fiber and plant diversity. And because it tastes delicious on just about anything and adds a satisfying crunch, it quite quickly slots into your life, becoming a daily healthy habit you'll always have time for. By the way, whenever we talk about Daily 30 as a good source of fiber, we're required to say that it contains four grams of total fat per serving. Obviously, that's all amazing healthy fats from plants. So order yours today at zoe.com slash daily30. Thanks for listening and see you next time.

From the publisher

From fads to fallacies, misconceptions have permeated diet narratives for decades. So, we dig in and demystify to forge a personalized path toward sustainable well-being.
In today’s episode, Jonathan is joined by Prof. Christopher Gardner and podcast regular Dr. Sarah Berry. Christopher is a professor of medicine at Stanford University and the director of nutrition studies at the Stanford Prevention Research Center. Sarah is an associate professor in nutrition at King’s College London and chief scientist at ZOE.
🌱 Try our new plant based wholefood supplement - Daily 30
*Naturally high in copper which contributes to normal energy yielding metabolism and the normal function of the immune system
Learn how your body responds to food 👉 zoe.com/podcast for 10% off
Follow ZOE on Instagram.
Timecodes:
00:00 Intro
01:00 Quick fire questions
02:30 Why do people go on diets?
05:07 Is it too late to change your diet?
06:28 How to adopt a better diet lifestyle in the long term
11:06 What are the worst diets for our health?
16:47 Why is there such a big gap between the scientific evidence and what we see on the shelves?
19:49 What should we do to improve our diet?
25:40 Do whole foods make us feel more full?
31:14 What does plant based mean and how does it tie in with the mediterranean diet?
32:14 Why is fiber so good for us?
35:50 Is it healthy to have fat in your diet?
37:03 Are reduced fat foods in supermarkets as good as they claim to be?
39:33 Low carb vs low fat study
45:07 What dietry revalations can we expect to see this year?
52:15 Summary
57:39 Goodbyes/Outro
Mentioned in today’s episode: 

Life expectancy can increase by up to 10 years following sustained shifts towards healthier diets in the United Kingdom in Nature 

Popular dietary patterns: Alignment with American Heart Association 2021 dietary guidance: A scientific statement from the American Heart Association in AHA Journals

Cardiometabolic effects of omnivorous vs vegan diets in identical twins: A randomized clinical trial in JAMA Network 

Ultra-processed diets cause excess calorie intake and weight gain: An inpatient randomized controlled trial of ad libitum food intake in Cell Metabolism

Effect of low-fat vs low-carbohydrate diet on 12-Month weight loss in overweight adults and the association with genotype pattern or insulin secretion: The DIETFITS randomized clinical trial in JAMA Network

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