(AP) - A striking new study says almost 1 in 5 American 4-year-olds is obese, and the rate is alarmingly higher among American Indian children, with nearly a third of them obese. Researchers were surprised to see differences by race at so early an age. Obesity is more common in Hispanic and black youngsters, too, but the disparity is most startling in American Indians, whose rate is almost double that of whites. More»