Fructose, a sugar used to sweeten many foods and drinks, appears to trigger changes in the brain that can lead to overeating.

Researchers found when people drank a fructose beverage, their brains did not register the feeling of being full like it did when they consumed drinks with simple glucose.

Scientists say these results do not prove that fructose causes obesity, but note that the percentage of overweight Americans has skyrocketed with the increased consumption of the sweetener.