An epidemic of obesity is compromising the lives of millions of American children, with burgeoning problems that reveal how much more vulnerable young bodies are to the toxic effects of fat.

In ways only beginning to be understood, being overweight at a young age appears to be far more destructive to well-being than adding excess pounds later in life. Virtually every major organ is at risk. The greater damage is probably irreversible.

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On a playground, obesity exerts a cruel price. "It robs them of their childhood, really," said Melinda S. Sothern of the Louisiana State University Health Sciences Center in New Orleans. "They're robbed of the natural enjoyment of being a kid -- being able to play outside, run. If they have high blood pressure, they have a constant risk of stroke."