As a doctor, it is my job to figure out the best way to keep my patients healthy. From my perspective, food is medicine, perhaps the most powerful drug on the planet with the power to cause or cure most disease. If food is more than just calories, if food is information that controls every aspect of our biology and health, then I better know what to advise people to prevent, treat and even reverse chronic disease.
On the one hand, Lebron James is eating Paleo and the No. 1 tennis player in the world cut out gluten and dairy and went from not winning at all to winning everything in just one year. But on the other hand, Rich Roll completed five Iron Man marathons in seven days on a vegan diet.