Thousands of individual per and polyfluoroalkyl substances (PFAS) fill personal care products, firefighting foams, food packaging, and many other household items.

"These gut bacteria influence weight because they regulate the amount of fat we absorb," researchers explain.

Overweight preteens display changes in cognitive performance, brain structure, and brain circuitry compared to those with a normal weight.

A study finds kids today are 30 percent less aerobically fit than their parents at the same age and rising temperatures may be to blame.

This diet is rich in low-protein foods like berries, fish, root vegetables, and whole grains, and can instill healthier eating habits.

A study of Amazonian children challenges current theories about the causes of obesity -- saying the problem is likely a poor diet and not poor fitness.