“The less we spend on food, the more we spend on health care,” author and food activist Michael Pollan said on Oprah. Today, Americans spend almost 20 cents of every dollar managing disease -- diabetes, allergies, asthma, cancer, obesity -- and only 10 cents of every dollar on food. The jury is still out on what exactly may be causing all these epidemics, but genetics don't change that quickly. The environment does. And increasing evidence points to the role that diet is playing in the onset of disease.