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Research may provide new link between soft drinks and weight gain

A University of Cincinnati (UC) study provides new evidence that drinking large amounts of beverages containing fructose adds body fat, and might explain why sweetening with fructose could be even worse than using other sweeteners.

Researchers allowed mice to freely consume either water, fructose sweetened water or soft drinks. They found increased body fat in the mice that drank the fructose-sweetened water and soft drinks--despite that fact that these animals decreased the amount of calories they consumed from solid food.

This, said author Matthias Tschöp, MD, associate professor in UC's psychiatry department and a member of the Obesity Research Center at UC's Genome Research Institute, suggests that the total amount of calories consumed when fructose is added to diets may not be the only explanation for weight gain. Instead, he said, consuming fructose appears to affect metabolic rate in a way that favors fat storage.

"Our study shows how fat mass increases as a direct consequence of soft drink consumption," said Dr. Tschöp.

The research appears in the July 2005 issue of Obesity Research, the official journal of the North American Association for the Study of Obesity (NAASO).

Consumption of sweetened foods and beverages containing sucrose and high-fructose corn syrup?particularly carbonated soft drinks and some juices and cereals--has been thought to be a leading cause of obesity. A widely used sweetener derived from corn, high-fructose corn syrup is similar to sucrose (table sugar) in its composition, about half glucose and half fructose.

Dr. Tschöp's lab used novel body composition analyzers that use magnetic resonance technology to carefully monitor body fat in mice.

All the mice began the study at an average weight of 39 grams. Those consuming the fructose-sweetened water showed significant weight gain over the course of the study, with an average final weight of 48 grams--compared with averages below 44
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Source:University of Cincinnati


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