Our evolutionary ancestors once possessed the ability to intuit what food their bodies needed, and ate the right things in the proper amounts. When and why did we lose this ability, and how can we get it back? Looking for answers, David Raubenheimer and Stephen Simpson traveled the globe, and their surprising conclusions have profound implications for our current epidemic of metabolic diseases and obesity. Offering a unifying theory of nutrition, this book details the side effects of fad diets, and encourages us to make delicious and healthy foods into integral parts of proper eating.