Abstract

Background: Bariatric surgeries are the most effective treatments for successful and sustained weight loss but individuals vary in treatment response. Understanding the neurobiological and behavioral mechanisms accounting for this variation could lead to the development of personalized therapeutic approaches and improve treatment outcomes. The primary objectives were to investigate changes in taste preferences and taste-induced brain responses after Roux-en-Y gastric bypass (RYGB) and vertical sleeve gastrectomy (VSG) and to identify potential taste-related predictors of weight loss. Methods: Women, ages 18 to 55, with a body mass index ≥ 35 kg/m2 and approved for bariatric surgery at the Johns Hopkins Center for Bariatric Surgery were recruited for participation. Demographics, anthropometrics, liking ratings, and neural responses to varying concentrations of sucrose+fat mixtures were assessed pre- and post-surgery via visual analogue scales and functional magnetic resonance imaging. Results: Bariatric surgery produced decreases in liking for sucrose-sweetened mixtures. Greater preference for sucrose-sweetened mixtures prior to surgery was associated with greater weight loss in RYGB but not VSG. In the RYGB group only, individuals who showed lower taste-induced activation in the ventral tegmental area (VTA) prior to surgery and greater changes in taste-induced VTA activation two weeks following surgery experienced better weight loss. Conclusions: The anatomical and/or metabolic changes associated with RYGB may more effectively “reset” the neural processing of reward stimuli, thereby rescuing the blunted activation in the mesolimbic pathway found in patients with obesity. Further, these findings suggest that RYGB may be particularly effective in patients with a preference for sweet foods. Trial Registration: Not Applicable.Funding: K23DK100559 and The Dalio Philanthropies. Funding: K23DK100559 and The Dalio Philanthropies.

Authors

Kimberly R. Smith, Afroditi Papantoni, Maria G. Veldhuizen, Vidyulata Kamath, Civonnia Harris, Timothy H. Moran, Susan Carnell, Kimberley E. Steele

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