Impulsivity predicts weight loss after obesity surgery.

Area of Science:

• Behavioral Science
• Clinical Psychology
• Obesity Research

Background:

• Executive function, particularly inhibitory control, is linked to obesity and eating behaviors.
• While bariatric surgery yields significant weight loss, the influence of personality traits on outcomes remains unclear.
• The specific impact of impulsivity on post-bariatric surgery weight reduction is not well understood.

Purpose of the Study:

• To investigate if personality traits and inhibitory control predict weight loss following bariatric procedures.
• To explore the relationship between impulsivity, inhibitory control, and BMI reduction in bariatric patients.

Main Methods:

• Forty-five bariatric patients (gastric bypass and sleeve gastrectomy) were recruited.
• Participants completed measures of impulsivity (Barratt's Impulsivity Scale) and inhibitory control (stop-signal reaction-time task).
• Measures were analyzed in relation to body mass index (BMI) changes six months post-surgery.

Main Results:

• Both the surgical procedure and changes in inhibitory control (SSRT) significantly predicted BMI reduction.
• Gastric bypass resulted in a 25% BMI reduction, significantly greater than the 14.1% reduction seen with sleeve gastrectomy.
• Increased pre- and post-operative inhibitory control (reduced impulsivity) positively correlated with greater BMI reduction.

Conclusions:

• Impulsivity measures are significant predictors of weight reduction after bariatric surgery.
• These findings have implications for predicting the success of surgical interventions for obesity.
• Assessing pre-operative impulsivity and inhibitory control may aid in patient selection and post-operative management.