Sugar can give you a quick rush, but that's not the only fast thing it can give you.

Scientists say there's a possibility fructose is making us fatter, and it's happening faster than you may think.

Fructose from high fructose corn syrup worked its way into much of the American diet... from cereal to soda and beans to break.

A University of Texas Southwestern researcher put different kinds of sugars to the test and found fructose built up the most fat in a person's body.

"When fructose was present in the sweet drink, whether it was at 50% of its concentration, or 75%, we found that the fat synthesis rate, was more than twice, almost three times the rate as when we just fed glucose alone," said University of Texas Southwestern researcher Elizabeth Parks.

Nutritionists say the findings are very important considering how widespread high fructose corn syrup is in the American diet.