What evolution reveals about eating, dieting and fat

This is fresh air. I am Terry Gross. Whether you want to lose weight or just eat healthy. It's sometimes confusing to know what to eat. There's a lot of contradictory advice and diets that are the opposite of other diets. Do wanna go low fat, high carbs or Low carbs, high fat. Do you want to be vegan or eat mostly meat? How about the paleo diet and eat like our distant ancestors? How much salt should you eat? There's contradictory advice about that too. If you're trying to lose weight, should you consider GLP ones?

What do we know about the possible side effects? To make sense of all of this. It's helpful to know something about how our digestive systems evolved. In ways that make some foods harmful and make it difficult to lose weight and challenging to keep it off.

My guest Daniel Lieberman studies how evolution has affected our digestive system and the amount of exercise we get and need. He's a professor at Harvard and founding chair of its department of human evolutionary biology. His new book is titled Fed Up. What evolution reveals about food. Diet. Health.

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