It's Not Just Genetics

James Erin de Jauregui for TIME

Bad food is easier to come by than good in too many places. Here junk fare is sold right outside a school.

Safety Community Environment Education Race Income Diet Neighborhood Poverty

You're a native-American baby born into the Oglala Sioux tribe, living on the Pine Ridge reservation in South Dakota. There are a lot of things that are going to make life a challenge for you, but one of the most perilous will be your weight. Chances are very good that your parents already have a weight problem; obesity is rampant in the 30,000-member community, and half the residents over the age of 40 have Type 2 diabetes. Their genes--and yours, of course--are part of the problem: researchers theorize that Native Americans have...