We all make a lot of assumptions about food, and healthy eating — including the idea that if you just make different choices, you can avoid obesity, or take the weight off. Turns out it's not so simple. We talk to health journalist Julia Belluz, and research scientist Kevin Hall, co-authors of a new book called Food Intelligence, to dig into the science of what we eat, why we eat it, and how changing our food environment may be the key to a healthier future.
