Higher body weight-dependent neural activation during reward processing

Author:

Richter Maike,Widera Sophia,Malz Franziska,Goltermann Janik,Steinmann Lavinia,Kraus Anna,Enneking Verena,Meinert Susanne,Repple Jonathan,Redlich Ronny,Leehr Elisabeth J.,Grotegerd Dominik,Dohm Katharina,Kugel Harald,Bauer Jochen,Arolt Volker,Dannlowski Udo,Opel Nils

Abstract

AbstractObesity is associated with alterations in brain structure and function, particularly in areas related to reward processing. Although brain structural investigations have demonstrated a continuous association between higher body weight and reduced gray matter in well-powered samples, functional neuroimaging studies have typically only contrasted individuals from the normal weight and obese body mass index (BMI) ranges with modest sample sizes. It remains unclear, whether the commonly found hyperresponsiveness of the reward circuit can (a) be replicated in well-powered studies and (b) be found as a function of higher body weight even below the threshold of clinical obesity. 383 adults across the weight spectrum underwent functional magnetic resonance imaging during a common card-guessing paradigm simulating monetary reward. Multiple regression was used to investigate the association of BMI and neural activation in the reward circuit. In addition, a one-way ANOVA model comparing three weight groups (normal weight, overweight, obese) was calculated. Higher BMI was associated with higher reward response in the bilateral insula. This association could no longer be found when participants with obesity were excluded from the analysis. The ANOVA revealed higher activation in obese vs. lean, but no difference between lean and overweight participants. The overactivation of reward-related brain areas in obesity is a consistent finding that can be replicated in large samples. In contrast to brain structural aberrations associated with higher body weight, the neurofunctional underpinnings of reward processing in the insula appear to be more pronounced in the higher body weight range.

Funder

Innovative Medizinische Forschung, Münster, Germany

Research Grant of the University Medical Center Giessen and Marburg

Deutsche Forschungsgemeinschaft

Universitätsklinikum Jena

Publisher

Springer Science and Business Media LLC

Subject

Behavioral Neuroscience,Psychiatry and Mental health,Cellular and Molecular Neuroscience,Neurology (clinical),Cognitive Neuroscience,Neurology,Radiology, Nuclear Medicine and imaging

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