The muscles and organs don't use insulin as well after then, so it takes more to get the same job done, he said.
Getting kids to a good weight by 13 may help avoid diabetes →
"That's a pretty common genetic defect," said Dr. Stephen Daniels, chairman of pediatrics at the University of Colorado School of Medicine and a member of the U.S. expert panel.
Cholesterol test for 1-year-olds? Study says it could help →