Anthropologists Show That What Kids Eat Matters More than What They Do     Over 13 million American children and teens are now classified as obese, and many others are overweight. During the past year, we have seen how obesity puts a body at risk for severe disease and death; starting on that path young makes for an extremely unhealthy outlook.   Sociologists, nutritionists, pediatricians, and child educators have done many studies trying to figure out why so many kids end up fat when childhood has normally been a time of high-energy…