The study of 60 children, ages 9 to 11, also found overweight children ate 101 percent more, and normal weight children ate 84 percent more after watching a series of TV food and toy ads, followed by a cartoon.

The children in the study were offered different kinds of foods, and the obese children consistently chose the highest fat item -- chocolate. Overweight children preferred jelly sweets, as well as chocolate.

"Our research confirms food TV advertising has a profound effect on all children's eating habits -- doubling their consumption rate. The study was also particularly interesting in suggesting a strong connection between weight and susceptibility to over-eating when exposed to food adverts on television," Dr. Jason Halford, director of the Kissileff Human Ingestive Behaviour Laboratory at the University of Liverpool, said in a prepared statement.

The study was presented this week at the European Congress on Obesity in Budapest.

The researchers plan further studies to investigate whether increased responsiveness to TV food ads or large amounts of TV viewing can predict childhood obesity.