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Nutrition advice often reduces food to calories, nutrients, and a list of rules to follow. But the more we learn about how the body responds to different foods, the clearer it becomes that this way of thinking tells only part of the story.
Today, I’m joined by cardiologist and public health expert Dr. Dariush Mozaffarian, director of the Food is Medicine Institute at Tufts University and author of the new book Food Is Medicine. We explore what we still get wrong about food and what changes when we begin treating it more like medicine.
Here’s what we discuss:
Why eating less and exercising more may not lead to lasting weight loss, and what to focus on instead
How to choose foods that work with your appetite, metabolism, and microbiome rather than relying on calorie counting
What GLP-1 medications can teach all of us about hunger, cravings, and why weight isn’t simply about willpower
How much protein you actually need and why the source matters
What the science says about seed oils and which processed foods are worth avoiding
Over the years, I’ve learned to focus less on counting calories or chasing a single nutrient and more on the quality of the food itself. When you eat real, whole foods, the signals that regulate hunger and energy can begin to work with you instead of against you. Eating well should be less about following rules and more about understanding what helps your body function at its best.
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0:00 The paradox of rising obesity, calorie intake, and the importance of food quality over willpower
2:00 Introduction to Food is Medicine and Dr. Hyman’s mission
4:25 How medical training ignored nutrition and early challenges to low-fat dogma
7:48 Cardiac diets, processed carbs, and failures in nutrition science translation
10:54 The food system’s role in chronic disease and its national impact
12:15 Food as a health, economic, environmental, and equity issue
15:05 How science, policy, and business shaped the modern food system
18:14 Fixing the food system using the same forces that created it
19:04 The birth of modern nutrition science and discovery of vitamins
20:15 Deficiency diseases, vitamin fortification, and enriched grains
23:16 The green revolution, famine fears, and calorie-focused agriculture
27:04 Low-fat advice, tobacco-era marketing, and the rise of ultra-processed food
31:29 Misapplied nutrient thinking: fat vilification and chronic disease
33:30 Why calories in, calories out fails for obesity and weight control
36:53 Thermogenesis, brown fat, and food quality’s impact on metabolism
39:25 The microbiome’s role in calorie harvesting and weight regulation
41:03 Real food vs. calorie counting for long-term weight control
43:09 GLP-1, the microbiome, and how the food system hijacks appetite
48:27 Feeding your inner garden: microbiome foods, prebiotics, and protective foods
50:47 Food as medicine: adding good foods vs. deprivation
52:36 Food as a fast, personalized therapy for chronic disease
54:11 What ultra-processed food is and why it’s harmful
59:59 Why junk food isn’t food, and the protein craze explained
1:00:44 How much protein you need and why the source matters
1:03:55 Best protein sources and the dangers of processed meats
1:05:58 Seed oils, trans fats, omega-6s, and omega-3 deficiency
1:13:57 Why food system change is needed, not just individual willpower
1:15:20 Policy levers for fixing agriculture, labeling, regulation, and nutrition science
1:17:29 How health care can drive food as medicine
1:21:58 How investing in healthy food can reshape markets and outcomes
1:22:44 Food industry lobbying, misinformation, and policy challenges
1:25:07 Business innovation to shift toward healthier food products
1:26:03 Ultra-processed foods as “coal” and replacing them with clean food
1:26:25 What listeners can do in their communities and with officials
