When First Lady Michelle Obama decided to launch the "Let's Move" campaign to fight childhood obesity, she brought much needed attention to a crisis facing millions of children. It's a special concern for children of color because new research shows Black and Hispanic children are disproportionally at risk for nearly a dozen factors that increase their chances to be obese. But children of color are far from the only ones in danger. Experts estimate one-third of American children are currently overweight or obese, and these rates have tripled among children ages 12 to 19 since 1980. Some adults may see a heavy child as a sign of a healthy eater, or think that for children, extra weight is mainly just a cosmetic issue. But serious risks for overweight children go far beyond appearance.