Episodes

  • E284: The Science of How Food Both Nourishes and Harms Us

    E284: The Science of How Food Both Nourishes and Harms Us
    Oct 16 2025
    An avalanche of information besets us on what to eat. It comes from the news, from influencers of every ilk, from scientists, from government, and of course from the food companies. Super foods? Ultra-processed foods? How does one find a source of trust and make intelligent choices for both us as individuals and for the society as a whole. A new book helps in this quest, a book entitled Food Intelligence: the Science of How Food Both Nourishes and Harms Us. It is written by two highly credible and thoughtful people who join us today.Julia Belluz is a journalist and a contributing opinion writer for the New York Times. She reports on medicine, nutrition, and public health. She's been a Knight Science Journalism Fellow at MIT and holds a master's in science degree from the London School of Economics and Political Science. Dr. Kevin Hall trained as a physicist as best known for pioneering work on nutrition, including research he did as senior investigator and section chief at the National Institutes of Health. His work is highly regarded. He's won awards from the NIH, from the American Society of Nutrition, the Obesity Society and the American Physiological Society. Interview Transcript Thank you both very much for being with us. And not only for being with us, but writing such an interesting book. I was really eager to read it and there's a lot in there that people don't usually come across in their normal journeys through the nutrition world. So, Julia, start off if you wouldn't mind telling us what the impetus was for you and Kevin to do this book with everything else that's out there. Yes, so there's just, I think, an absolute avalanche of information as you say about nutrition and people making claims about how to optimize diet and how best to lose or manage weight. And I think what we both felt was missing from that conversation was a real examination of how do we know what we know and kind of foundational ideas in this space. You hear a lot about how to boost or speed up your metabolism, but people don't know what metabolism is anyway. You hear a lot about how you need to maximize your protein, but what is protein doing in the body and where did that idea come from? And so, we were trying to really pair back. And I think this is where Kevin's physics training was so wonderful. We were trying to look at like what are these fundamental laws and truths. Things that we know about food and nutrition and how it works in us, and what can we tell people about them. And as we kind of went through that journey it very quickly ended up in an argument about the food environment, which I know we're going to get to. We will. It's really interesting. This idea of how do we know what we know is really fascinating because when you go out there, people kind of tell us what we know. Or at least what they think what we know. But very few people go through that journey of how did we get there. And so people can decide on their own is this a credible form of knowledge that I'm being told to pursue. So Kevin, what do you mean by food intelligence? Coming from a completely different background in physics where even as we learn about the fundamental laws of physics, it's always in this historical context about how we know what we know and what were the kind of key experiments along the way. And even with that sort of background, I had almost no idea about what happened to food once we ate it inside our bodies. I only got into this field by a happenstance series of events, which is probably too long to talk about this podcast. But to get people to have an appreciation from the basic science about what is going on inside our bodies when we eat. What is food made out of? As best as we can understand at this current time, how does our body deal with. Our food and with that sort of basic knowledge about how we know what we know. How to not be fooled by these various sound bites that we'll hear from social media influencers telling you that everything that you knew about nutrition is wrong. And they've been hiding this one secret from you that's been keeping you sick for so long to basically be able to see through those kinds of claims and have a bedrock of knowledge upon which to kind of evaluate those things. That's what we mean by food intelligence. It makes sense. Now, I'm assuming that food intelligence is sort of psychological and biological at the same time, isn't it? Because that there's what you're being told and how do you process that information and make wise choices. But there's also an intelligence the body has and how to deal with the food that it's receiving. And that can get fooled too by different things that are coming at it from different types of foods and stuff. We'll get to that in a minute, but it's a very interesting concept you have, and wouldn't it be great if we could all make intelligent choices? Julia, you mentioned the food environment. How would you describe the modern food environment and how ...
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    34 mins
  • E283: Taylor Hanson's Food On The Move

    E283: Taylor Hanson's Food On The Move
    Sep 24 2025
    Interview Summary You know I really like the innovative nature of Food On The Move, and I'm eager for you to tell us more about what it involves. But before we do that, how does a young, highly successful musician turn to battling food insecurity? What led you to create Food On The Move? It took me years to say I even created it. I didn't even use the term founder because I really had this sense of partnership that was a part of how it came to be. But I did found or 'start' Food On The Move because I have just a deep sense of gratitude in my life experience and also maybe a calling? I call it the tap on the shoulder that said there's more for you to do. There's more for me to do. And I didn't really know what that meant. I wanted to invest in Oklahoma and where we're from because as a musician, first you travel, you leave, you go out, you connect with people all over the world. But there's something about building and doing well for your community from the town you're from. And I was inspired by a former US ambassador. A man named Edward Perkins, who was an incredible representative of our country. He worked in some of the most difficult parts of the world representing the US and working with other nations. And his story struck me so deeply because he found ways to partner and transform communities as an ambassador. And I got to know him after his time as an ambassador because he was teaching as a professor at OU (Oklahoma University), in Oklahoma. And I asked him, I said - I want to honor your life. I want to learn from you. If I was to begin to really impact my community, Oklahoma where I'm from and maybe beyond, where would you begin? And he said, I would start with food. That's so interesting. You know, your concept of partnership is so interesting. I'd like to dive into that a little bit deeper in a little bit. But first, tell us about your organization and what it does, how it works, what it tries to accomplish. Yes. So, inspired by Ambassador Perkins' example, we set out to ask the right questions more than have the answers. And in 2014, I just basically cold called everyone in the community that worked in food - from the food bank to the food pantries and said ‘help me understand the gaps.’ Help me understand where it's hard to accomplish change. And the term food desert began coming up more and more. And food deserts are communities without grocery stores. So, think of it as the canary in the mine. Sort of when a grocery store goes, the neighborhood is declining. Because they're small margin organizations they have a hard time staying afloat and when they go it's hard to bring them back because you need either a company like a big chain or a small business that doesn't have a lot of resources. And oftentimes that decline continues, and it impacts the community. So, with Food On The Move I basically brought together partners to create an access point in food deserts where it's was all in kind. From food trucks that could bring great, tasty food and give people dignity and excitement and energy, to partners that are doing food safety training and teaching people to cook. And places like Oklahoma State University extension where they train people about how to prepare food because they may not know. And so, all these partners came together, and we basically spent five years just learning and serving people in those communities. And focusing on an environment that was not about raising a bunch of money; it was really about who is already in this space that we can garner relationships with and get to know the communities. And now those events continue to be flagships. We call them food and resource festivals. They are a pay-as-you-can. You show up, you get access to fresh produce, you have food trucks, you have wraparound services. You have people that are in the community, in different nonprofits, for-profits, and government organizations that we all collaborate with. And we reach people where they are while serving and getting to know them and learning from them. And through those relationships, through those events - which we still do - what it's brought us to is the innovation and education side, and ultimately transformation. We realized in order to change food deserts, end food deserts, bring grocery stores back, that we had to get to the heart of the food system. Which is we had to be teaching people to grow things again, rebuild the local foundation of farmers being trained, use new, innovative systems like indoor growing and aquaponics, hydroponics. And basically, we had to kind of build the foundation back that's been lost since post World War II in our community, like many places. And that means a food hub to bridge farmers to distributors. That means training those farmers for the future. And it ultimately means building a new model for a grocery store. So, we are at the heart of that now with a project we call Food Home, where we are building a campus that is like a microcosm of the...
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    33 mins
  • E282: Are healthy, environmentally sustainable diets economically achievable for everyone?

    E282: Are healthy, environmentally sustainable diets economically achievable for everyone?
    Sep 19 2025
    In today's episode, we're discussing the complex and urgent topic of global food demand. The United Nations Sustainable Development Goals, or SDGs, ask countries to make measurable progress in reducing poverty, achieving zero hunger, and supporting every individual in realizing good health. While also mitigating climate change, sustaining the environment and responsible consumption and production habits. Researchers have recommended sustainable diets - planetary health diets. For example, the Eat Lancet Planetary Health Diet. However, others have criticized some of these diets for not addressing the economic and social impacts of transitioning to such diets. Is it possible to balance changing diets, rising incomes, and economic growth with economic feasibility, environmental impact, and long-term sustainability? Well, that's what our goals are today. Our guests today are Andrew Muhammad of the University of Tennessee Institute of Agriculture, and Emiliano Lopez Barrera from Texas A&M. They are my co-authors on a new paper in the Annual Review of Resource Economics entitled Global Food Demand: overcoming Challenges to Healthy and Sustainable Diets. Interview Summary Andrew let's begin with you. Why is it important to study the economics of dietary habits and food choices in a global context? Well, it's important for several reasons, right? When we think both about food security as well as environmental outcomes and maintaining biodiversity, in keeping both human beings and the planet healthy, we really do need to think about this in a global context. One could see agriculture as a global ecosystem where decisions in one country clearly have impacts on outcomes in others. While at the same time, we need to see food as a means by which we satisfy the demands of a global community. Whether it be through our own domestic production or international trade. And then the last thing I'll say, which is really most important are all the actual things we want to tackle and mitigate and correct, fix or improve. Whether it be the environmental issues, global food security outcomes, individual diets, mitigating obesity issues globally, right? It's pretty clear that most of the things affecting human beings in the environment as it relates to agriculture are global in nature, and there's an economic component that we need to consider when addressing these issues in a global context. Thank you for sharing that. And I am interested to understand what the role of economics in dietary habits is as we explored it in this review paper. In economics, this is a pretty long history, one could say going back centuries, right? This idea of how income growth impacts food spending on a household or individuals, as well as what economic affluence in development does to sort of how diets transition. And so, for example, it's been long established, right, as individuals get richer, a smaller and smaller share of their income is spent on food. So therefore, food dynamics become less important in [a developed, rich country versus a developing country where a large percentage of income is still spent on food. And what does that mean? That means that while I may find price shocks annoying, and while I may find higher grocery prices annoying, in a developing world that clearly has some implications on the nutritional needs and food decisions far more than it would have on me, for example. But the other thing which is something that has been highlighted for quite some time, and that is this transition from basic staples - from rice, grain, corn, cassava, potatoes, etc. - to more complex food products like high protein dense meat products, fish, milk, dairy, and even highly processed products that are deemed unhealthy. But the point is, as we look at the full spectrum of countries from least developed to most developed, you see this transition from basic staples to these protein dense products as well as complex processed products. This is a really important point about what are the trends across countries and over time as incomes change and as global prices affect choices. And I do appreciate what you're saying about those of us in, say a country like the United States, where we may be able to absorb some of the shocks that may happen with food prices, we also recognize that there are folks from lower income households where those kinds of price shocks can be really challenging. That's true. But this is a different story when we're then talking about developing countries and some of the challenges that they face. Thank you for sharing that. I'm also interested in understanding what do economists mean by a nutritious and sustainable food demand, especially in the context of global or cross-country comparisons. What are some of the things that you uncovered in this review? Yes, and I think the main thing, which is particularly interesting, is how early diets transition. How quick countries go from being staple dependent to sort of relying ...
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    32 mins
  • E281: Is ultra-processed food still food?

    E281: Is ultra-processed food still food?
    Aug 28 2025
    Lots of talk these days about ultra-processed foods (UPFs). Along with confusion about what in the heck they are or what they're not, how bad they are for us, and what ought to be done about them. A landmark in the discussion of ultra-processed foods has been the publication of a book entitled Ultra-processed People, Why We Can't Stop Eating Food That Isn't Food. The author of that book, Dr. Chris van Tulleken, joins us today. Dr. van Tulleken is a physician and is professor of Infection and Global Health at University College London. He also has a PhD in molecular virology and is an award-winning broadcaster on the BBC. His book on Ultra-processed People is a bestseller. Interview Summary Chris, sometimes somebody comes along that takes a complicated topic and makes it accessible and understandable and brings it to lots of people. You're a very fine scientist and scholar and academic, but you also have that ability to communicate effectively with lots of people, which I very much admire. So, thanks for doing that, and thank you for joining us. Oh, Kelly, it's such a pleasure. You know, I begin some of my talks now with a clipping from the New York Times. And it's a picture of you and an interview you gave in 1995. So exactly three decades ago. And in this article, you just beautifully communicate everything that 30 years later I'm still saying. So, yeah. I wonder if communication, it's necessary, but insufficient. I think we are needing to think of other means to bring about change. I totally agree. Well, thank you by the way. And I hope I've learned something over those 30 years. Tell us, please, what are ultra-processed foods? People hear the term a lot, but I don't think a lot of people know exactly what it means. The most important thing to know, I think, is that it's not a casual term. It's not like 'junk food' or 'fast food.' It is a formal scientific definition. It's been used in hundreds of research studies. The definition is very long. It's 11 paragraphs long. And I would urge anyone who's really interested in this topic, go to the United Nations Food and Agricultural Organization website. You can type in NFAO Ultra and you'll get the full 11 paragraph definition. It's an incredibly sophisticated piece of science. But it boils down to if you as a consumer, someone listening to this podcast, want to know if the thing you are eating right now is ultra-processed, look at the ingredients list. If there are ingredients on that list that you do not normally find in a domestic kitchen like an emulsifier, a coloring, a flavoring, a non-nutritive sweetener, then that product will be ultra-processed. And it's a way of describing this huge range of foods that kind of has taken over the American and the British and in fact diets all over the world. How come the food companies put this stuff in the foods? And the reason I ask is in talks I give I'll show an ingredient list from a food that most people would recognize. And ask people if they can guess what the food is from the ingredient list. And almost nobody can. There are 35 things on the ingredient list. Sugar is in there, four different forms. And then there are all kinds of things that are hard to pronounce. There are lots of strange things in there. They get in there through loopholes and government regulation. Why are they there in the first place? So, when I started looking at this I also noticed this long list of fancy sounding ingredients. And even things like peanut butter will have palm oil and emulsifiers. Cream cheese will have xanthum gum and emulsifiers. And you think, well, wouldn't it just be cheaper to make your peanut butter out of peanuts. In fact, every ingredient is in there to make money in one of two ways. Either it drives down the cost of production or storage. If you imagine using a real strawberry in your strawberry ice cream. Strawberries are expensive. They're not always in season. They rot. You've got to have a whole supply chain. Why would you use a strawberry if you could use ethyl methylphenylglycidate and pink dye and it'll taste the same. It'll look great. You could then put in a little chunky bit of modified corn starch that'll be chewy if you get it in the right gel mix. And there you go. You've got strawberries and you haven't had to deal with strawberry farmers or any supply chain. It's just you just buy bags and bottles of white powder and liquids. The other way is to extend the shelf life. Strawberries as I say, or fresh food, real food - food we might call it rots on shelves. It decays very quickly. If you can store something at room temperature in a warehouse for months and months, that saves enormous amounts of money. So, one thing is production, but the other thing is the additives allow us to consume to excess or encourage us to consume ultra-processed food to excess. So, I interviewed a scientist who was a food industry development scientist. And they said, you know, most ultra-processed food would be gray ...
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    48 mins
  • E280: Industry user fees could fix a food safety loophole for FDA

    E280: Industry user fees could fix a food safety loophole for FDA
    Aug 25 2025
    The Food and Drug Administration or FDA regulates roughly 78% of the US food supply. This includes packaged products, food additives, infant formula, ultra-processed foods, and lots more. However, an analysis by the Environmental Working Group found that 99% of new food ingredients enter our food supply through a legal loophole that skirts FDA oversight and seems, to me at least, to be incredibly risky. Today we're speaking with two authors of a recent legal and policy analysis published in the Journal Health Affairs. They explain what this loophole is and its risks and suggest a new user fee program to both strengthen the FDA's ability to regulate food ingredients and address growing concerns about food safety. Our guests are Jennifer Pomeranz Associate Professor of Public Health Policy and Management at New York University School of Global Public Health and Emily Broad, director of Harvard Law School Center for Health Law and Policy Innovation. Interview Summary So Jennifer, let's start with you, help our listeners understand the current situation with food ingredient oversight. And what is this legal loophole that allows food companies to add new ingredients without safety reviews. Sure. So, Congress passed the Food Additives Amendment in 1958, and the idea was to divide food additives and generally recognized as safe ingredients into two different categories. That's where the GRAS term comes from generally recognized as safe? ‘Generally Recognized As Safe’ is GRAS. But it circularly defines food additives as something that's not GRAS. So, there's not actually a definition of these two different types of substances. But the idea was that the food industry would be required to submit a pre-market, that means before it puts the ingredient into the marketplace, a pre-market petition to the FDA to review the safety. And then the FDA promulgates a regulation for safe use of a food additive. GRAS ingredients on the other hand, initially thought of as salt, pepper, vinegar, are things like that would just be allowed to enter the food supply without that pre-market petition. The problem is the food industry is the entity that decides which category to place each ingredient. There's no FDA guidance on which category they're supposed to ascribe to these ingredients. What has happened is that the food industry has now entered into the food supply an enormous amount of ingredients under what we call the GRAS loophole, which is allowing it to just bring it to the market without any FDA oversight or even knowledge of the ingredient. So, in essence, what we're having now is that the food industry polices itself on whether to submit this pre-market petition for a food additive or just include it in its products without any FDA knowledge. When you said ‘enormous number of such things,’ are we talking dozens, hundreds, thousands? Nobody knows, but the environmental working group did find that 99% of new ingredients are added through this loophole. And that's the concerning part. Well, you can look at some ultra-processed foods and they can have 30 or 40 ingredients on them. That's just one food. You can imagine that at across the food supply, how many things there are. And there are these chemicals that nobody can pronounce. You don't know what's going on, what they are, what they're all about. So, what you're saying is that the food industry decides to put these things in foods. There's some processing reason for putting them in. It's important that the public be protected against harmful ingredients. But the food industry decides what's okay to put in and what's not. Are they required to do any testing? Are there criteria for that kind of testing? Is there any sense that letting the industry police itself amounts to anything that protects the public good? Well, the criteria are supposed to be the same for GRAS or food additives. They're supposed to be meeting certain scientific criteria. But the problem with this is that for GRAS ingredients, they don't have to use published data and they can hold that scientific data to themselves. And you mentioned food labels, the ingredient list, right? That doesn't necessarily capture these ingredients. They use generic terms, corn oil, color additive, food additive whatever. And so, the actual ingredient itself is not necessarily listed on the ingredient list. There is no way to identify them and it's unknown whether they're actually doing the studies. They can engage in these, what are called GRAS panels, which are supposed to be experts that evaluate the science. But the problem is other studies have found that 100% of the people on these GRAS panels have financial conflicts of interest. Okay, so let me see if I have this right. I'm a food company. I develop a new additive to provide color or flavor or fragrance, or it's an emulsifier or something like that. I develop a chemical concoction that hasn't really been tested for human safety. I declare it safe. And the ...
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    31 mins
  • E279: Feed Us With Trees - the surprising importance of nuts

    E279: Feed Us With Trees - the surprising importance of nuts
    Jul 31 2025
    Every day, with few exceptions, I eat a handful of nuts. Usually a combination of almonds, walnuts, pecans, cashews, and pistachios. And they taste good for sure. But I'm responding mainly to research showing that consumption of nuts is related to less chronic disease. In particular, eating nuts lowers levels of inflammation related to heart disease and diabetes, and may improve cholesterol levels among other benefits. So, I saw it as welcome news that someone has just published a book about nuts, all aspects of nuts, actually. Today we're joined by NPR, food Writer Elspeth Hay author of a new book called Feed Us with Trees- nuts, and The Future of Food. And I had no idea. Nuts were so interesting until I dove in a little bit. Elspeth has gathered stories from dozens of nut growers, scientists, indigenous knowledge keepers, researchers and food professionals. She writes that humans once grew their staple crops in forest gardens of perennial nuts, such as oaks, chestnuts, and hazelnuts in these species. Particularly important to the environment as well as to human wellbeing. Interview Summary Elspeth, thanks so much for joining us and for writing such an amazing book. Thank you so much for having me. And it sounds like you have the same habit as my dad. He makes sure to eat a little bit of mixed nuts every night, ever since I can remember for his health. Let’s start by having you describe your book. Tell us about Feed us with Trees. Why did you write it and what's it about? I wrote it because I've been reporting on food in the environment for a long time, a little more than 15 years. And I had never heard anyone mention anything about eating acorns until a few years ago. And someone sent me a TEDx talk by a woman in Greece named Marcie Mayer, and she said, you can eat acorns. And not only that, but they're a super food nutritionally, and one of humanity's oldest foods. And I live in this giant oak forest that's protected on Cape Cod as part of the Cape Cod National Seashore. And I had always seen this forest as a sort of impediment to local food production, right? There's all this land that can't be farmed. And all that time, it turns out there was food literally raining down on my roof, underfoot in my driveway, and I just wasn't equipped to see it. The stories that I had grown up with hadn't mentioned that. And so that was a real eyeopener for me and I just couldn't stop thinking about it and I kept researching. So, have you started consuming acorns? I have, yes. I've collected them the past probably five falls and, you know, oaks do something called masting. Some years they have a really big production and some years smaller production. Some years I've gotten more than others. But I have started processing them at home and experimenting with different ways of using the flour. And I've also ordered online acorn oil. There are actually three food products that you can make from acorns. You can make starch, which works just like corn starch or potato starch. Thickens things. You can make flour and with some species you can make oil. It's actually a pretty diverse crop. That's so interesting. You know, I have a series of oak trees right outside my window and I never thought that they might be producing food I could consume. It's so interesting to hear your history with that. Yes, I mean I had no idea. And it turns out that actually acorns are very similar to olives in the way that they need to be processed. They're very high in these compounds that are very bitter, called tannins, just like an olive. I had the experience once of going to Italy with my husband, and we saw this olive grove and we thought, oh cool. Olives growing right here. And we picked one off the tree and he put his in his mouth and immediately spat it out and said, oh, that's awful. Tannins are not something that we want to eat. They don't taste good, but obviously they haven't hampered the olives rise to glory in terms of a human food source. And Acorns need the same kind of processing. So, tannins are water soluble. You pull them out with water. You know, you always get olives in brine, right? And so Yes, just started learning more about how to work with them and then also more about our relationship with oak trees. And I started seeing them differently in that light too. Going from sort of the species that I'd always seen as natural and wild and better off without humans, to actually understanding that we have a really long history with oak trees and in some places, they actually really depend on us. So that was total game changer for me. There's more to the story than oaks and acorns. Tell us what you learned about the history of humans eating nuts like acorns, but also things like chestnuts and hazelnut. Yes, I was really surprised. At first, I thought, okay, this is going to be an isolated thing where some people in really hilly areas or areas that aren't good for row crops are eating these nuts as staple foods. But when I ...
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    26 mins
  • E278: Here's how screen time affects our kids' eating, activity, and mental health

    E278: Here's how screen time affects our kids' eating, activity, and mental health
    Jul 15 2025
    Interview Summary So, you two, along with a number of other people in the field, wrote a chapter for a recently published book called The Handbook of Children and Screens. We discussed that book in an earlier podcast with its editors, Dmitri Christakis and Kris Perry, the executive director of the Children and Screens organization. And I'd like to emphasize to our listeners that the book can be downloaded at no cost. I'd like to read a quote if I may, from the chapter that the two of you wrote. 'Screen time continues to evolve with the advent of continuous and immersive video reels, voice activated assistance, social media influencers, augmented and virtual reality targeted advertising. Immersive worlds where children can virtually shop for food and beverages, cook or work in a fast-food outlet from a smartphone, a tablet, a computer, or an internet connected tv and more.' So as much as I follow the field, I still read that and I say, holy you know what. I mean that's just an absolutely alarming set of things that are coming at our children. And it really sounds like a tidal wave of digital sophistication that one could have never imagined even a short time ago. Amanda, let's start with you. Can you tell us a little bit more about these methods and how quickly they evolve and how much exposure children have? I think you're right, Kelly, that the world is changing fast. I've been looking at screen media for about 20 years now as a researcher. And in the earlier years, and Tom can attest to this as well, it was all about TV viewing. And you could ask parents how much time does your child spend watching TV? And they could say, well, they watch a couple shows every night and maybe a movie or two on the weekend, and they could come up with a pretty good estimate, 1, 2, 3 hours a day. Now, when we ask parents how much time their children spend with media, they have to stop and think, 'well, they're watching YouTube clips throughout the day. They're on their smartphone, their tablet, they're on social media, texting and playing all these different games.' It really becomes challenging to even get a grasp of the quantity of screen time let alone what kids are doing when they're using those screens. I will say for this book chapter, we found a really great review that summarized over 130 studies and found that kids are spending about three and a half or four hours a day using screens. Yet some of these studies are showing as high as seven or eight hours. I think it's probably under-reported because parents have a hard time really grasping how much time kids spend on screens. I've got a one-year-old and a five-year-old, and I've got some nieces and nephews and I'm constantly looking over their shoulder trying to figure out what games are they playing and where are they going online and what are they doing. Because this is changing really rapidly and we're trying to keep up with it and trying to make sure that screen time is a safe and perhaps healthy place to be. And that's really where a lot of our research is focused. I can only imagine how challenging it must be to work through that landscape. And because the technology advances way more quickly than the policies and legal landscape to control it, it really is pretty much whatever anybody wants to do, they do it and very little can be done about it. It's a really interesting picture, I know. We'll come back later and talk about what might be done about it. Tom, if you will help us understand the impact of all this. What are the effects on the diets of children and adolescents? I'm thinking particularly when Amanda was mentioning how many hours a day children are on it that three to four hours could be an underestimate of how much time they're spending. What did kids used to do with that time? I mean, if I think about when you and I were growing up, we did a lot of different things with that time. But what's it look like now? Well, that's one of the important questions that we don't really know a lot about because even experimental studies that I can talk about that look at reducing screen time have not been very good at being able to measure what else is going on or what substitutes for it. And so, a lot of the day we don't really know exactly what it's displacing and what happens when you reduce screen time. What replaces it? The assumption is that it's something that's more active than screen time. But, you know, it could be reading or homework or other sedentary behaviors that are more productive. But we really don't know. However, we do know that really the general consensus across all these studies that look at the relationship between screen time and nutrition is that the more time children spend using screens in general, the more calories they consume, the lower the nutritional quality of their diets and the greater their risk for obesity. A lot of these studies, as Amanda mentioned, were dominated by studies of television viewing, or looking at ...
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    43 mins
  • E277: Food Fight - from plunder and profit to people and planet

    E277: Food Fight - from plunder and profit to people and planet
    Jun 27 2025
    Today we're talking with health and nutrition expert Dr. Stuart Gillespie, author of a new book entitled Food Fight: from Plunder and Profit to People and Planet. Using decades of research and insight gathered from around the world, Dr. Gillespie wants to reimagine our global food system and plot a way forward to a sustainable, equitable, and healthy food future - one where our food system isn't making us sick. Certainly not the case now. Over the course of his career, Dr. Gillespie has worked with the UN Standing Committee on Nutrition in Geneva with UNICEF in India and with the International Food Policy Research Institute, known as IFPRI, where he's led initiatives tackling the double burden of malnutrition and agriculture and health research. He holds a PhD in human nutrition from the London School of Hygiene and Tropical Medicine. Interview Summary So, you've really had a global view of the agriculture system, and this is captured in your book. And to give some context to our listeners, in your book, you describe the history of the global food system, how it's evolved into this system, sort of warped, if you will, into a mechanism that creates harm and it destroys more than it produces. That's a pretty bold statement. That it destroys more than it produces, given how much the agriculture around the world does produce. Tell us a bit more if you would. Yes, that statement actually emerged from recent work by the Food Systems Economic Commission. And they costed out the damage or the downstream harms generated by the global food system at around $15 trillion per year, which is 12% of GDP. And that manifests in various ways. Health harms or chronic disease. It also manifests in terms of climate crisis and risks and environmental harms, but also. Poverty of food system workers at the front line, if you like. And it's largely because we have a system that's anachronistic. It's a system that was built in a different time, in a different century for a different purpose. It was really started to come together after the second World War. To mass produce cheap calories to prevent famine, but also through the Green Revolution, as that was picking up with the overproduction of staples to use that strategically through food aid to buffer the West to certain extent from the spread of communism. And over time and over the last 50 years of neoliberal policies we've got a situation where food is less and less viewed as a human right, or a basic need. It's seen as a commodity and the system has become increasingly financialized. And there's a lot of evidence captured by a handful of transnationals, different ones at different points in the system from production to consumption. But in each case, they wield huge amounts of power. And that manifests in various ways. We have, I think a system that's anachronistic The point about it, and the problem we have, is that it's a system revolves around maximizing profit and the most profitable foods and products of those, which are actually the least healthy for us as individuals. And it's not a system that's designed to nourish us. It's a system designed to maximize profit. And we don't have a system that really aims to produce whole foods for people. We have a system that produces raw ingredients for industrial formulations to end up as ultra processed foods. We have a system that produces cattle feed and, and biofuels, and some whole foods. But it, you know, that it's so skewed now, and we see the evidence all around us that it manifests in all sorts of different ways. One in three people on the planet in some way malnourished. We have around 12 million adult deaths a year due to diet related chronic disease. And I followed that from colonial times that, that evolution and the way it operates and the way it moves across the world. And what is especially frightening, I think, is the speed at which this so-called nutrition transition or dietary transition is happening in lower income or middle income countries. We saw this happening over in the US and we saw it happening in the UK where I am. And then in Latin America, and then more Southeast Asia, then South Asia. Now, very much so in Sub-Saharan Africa where there is no regulation really, apart from perhaps South Africa. So that's long answer to your intro question. Let's dive into a couple of things that you brought up. First, the Green Revolution. So that's a term that many of our listeners will know and they'll understand what the Green Revolution is, but not everybody. Would you explain what that was and how it's had these effects throughout the food systems around the world? Yes, I mean around the, let's see, about 1950s, Norman Borlag, who was a crop breeder and his colleagues in Mexico discovered through crop breeding trials, a high yielding dwarf variety. But over time and working with different partners, including well in India as well, with the Swaminathan Foundation. And Swaminathan, for example, managed to ...
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    25 mins