A new study finds striking evidence that children who are obese or have high cholesterol show early warning signs of heart disease.

The study, presented Tuesday at the American Heart Association conference in New Orleans, found that the thickness of artery walls of children and teenagers who are obese or have high cholesterol resembled the thickness of artery walls of an average 45-year-old.

The study, which has not yet been published, was small, involving 70 children ages 6 to 19, and several experts said the results would need to be replicated to be considered conclusive. But they said the method used to measure artery wall thickness was considered a reliable indicator of heart disease risk, usually more reliable than cholesterol levels or other measures. The method, which uses ultrasound, has been applied to children in other studies in the last few years, but experts said this appeared to be the first time that results had been correlated to adults.

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