Some overweight teens have health problems that used to be seen only in adults.

A new government-funded study shows about half the teens looking for weight-loss surgery are suffering from major illnesses linked with excess weight that were once found primarily in adults, like cholesterol problems, high blood pressure, joint pain and diseased livers and kidneys.

Another study has found a link between obesity and early puberty in girls.

Researchers have found that girls with higher body mass index may start developing breasts about a year before their thinner friends - in some cases as early as second grade.

- Rob Archer