Gastric Bypass Alters Sweet Taste Function

Gastric bypass surgery decreases the preference for sweet-tasting substances in obese rats, a study finding that could help in developing safer treatments for the morbidly obese, according to Penn State College of Medicine researchers.

"Roux-en-Y gastric bypass surgery is the most common effective treatment for morbid obesity," said Andras Hajnal, M.D., Ph.D., associate professor, Department of Neural and Behavioral Science and Surgery. "Many patients report altered taste preferences after having the procedure."

This surgery involves the creation of a small gastric pouch and bypassing a portion of the upper small intestine. Unlike other weight-reduction methods, it produces substantial and durable weight loss and significant improvements in obesity-related medical conditions including diabetes.

Study results in obese rats suggest that post-surgery changes in the gastrointestinal anatomy affect change in the brain that relate to taste...