Overweight and sedentary kids are more likely to have stiff arteries and may end up developing the typically adult disease atherosclerosis at a young age, according to the findings of a new study.

Researchers at the Medical College of Georgia have found that children with a greater body mass index, more body fat and less endurance had stiffer central arteries compared to leaner and fitter children. Stiff arteries are a hallmark of atherosclerosis, which is when arteries become clogged.

They looked at overweight or obese children between the ages of 8 and 11 years, half of whom participate in aerobic exercises such as jumping rope and playing basketball after school while the other half participate in sedentary activities, such as board games and crafts, for their findings.

Lead researcher Dr. Catherine Davis said that identifying sedentary, overweight kids early could help hasten preventive measures.

In addition to the stiff arteries, Davis’ team also discovered that regular exercise decreases metabolic risks linked to cardiovascular disease and diabetes.

Obesity rates in the U.S. have tripled in the past 30 years and as many as one third of American children are considered obese.

First lady Michelle Obama recently launched the "Let’s Move" initiative to help solve the obesity epidemic facing the nation.