Harvard Professor: “I Tried Every Diet. This Is By Far The Worst.” - Daniel Lieberman
In a Nutshell
Harvard evolutionary biologist Daniel Lieberman concludes that no single "optimal" diet exists—every approach has trade-offs, and the best evidence supports traditional Mediterranean-style eating patterns with whole grains, legumes, vegetables, olive oil, and minimal processed foods. He emphasizes that human physiology evolved as ultimate omnivores capable of thriving on diverse diets, and the modern obesity epidemic stems primarily from hyper-palatable ultra-processed foods engineered with combinations of fat, sugar, and additives that bypass satiety mechanisms. While restrictive diets like carnivore or raw food provide temporary structure, they're unsustainable long-term, and the real solution requires both individual agency in avoiding processed foods and systemic changes like better food labeling.
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Harvard evolutionary biologist Daniel Lieberman spent years researching every major diet and trying many of them himself while working on a book about the evolution of diet. He and his wife tested various diets on and off as he wrote the book to gain participant observations and firsthand experience rather than just studying them.
Lieberman's primary research focuses on physical activity, including the evolution of running, walking, and throwing. He also teaches nutrition, digestion, and physiology. He became confused by conflicting literature, noting that the same year the New England Journal of Medicine published articles claiming saturated fat is both good and bad for you, and that various amounts of salt are either too much or perfect.
Lieberman integrated an evolutionary perspective with biomedical, cultural, and anthropological data. He cites Theodosius Dobzhansky's 1972 statement that "nothing in biology makes sense except in the light of evolution." Evolution answers "why" questions, which leads to different thinking about "how" and "what" questions. Diet is no exception to this principle.
Lieberman agrees that nutrition and diet function like new religions with dogma, tribalism, and resistance to evidence. He attributes this to the breakdown of traditional cultural eating patterns. For millions of years, people ate according to their culture. Now people eat similar foods globally while institutions crumble, leading people to search for identity through what they eat or don't eat. Some diets function like cults with online nutritional theology and groupthink.
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