There is little evidence for obesity-related differences in enhanced neural reactivity to visual food cues & that such differences might be mediated by additional factors that are often not considered

Is obesity related to enhanced neural reactivity to visual food cues? A review and meta-analysis. Filip Morys, Isabel García-García, Alain Dagher. Social Cognitive and Affective Neuroscience, nsaa113, August 12 2020. https://doi.org/10.1093/scan/nsaa113

Abstract: Theoretical work suggests that obesity is related to enhanced incentive salience of food cues. However, evidence from both behavioral and neuroimaging studies on the topic is mixed. In this work we review the literature on cue reactivity in obesity and perform a preregistered meta-analysis of studies investigating effects of obesity on brain responses to passive food pictures viewing. Further, we examine whether age influences brain responses to food cues in obesity. In the meta-analysis we included 13 studies of children and adults that investigated group differences (obese vs. lean) in responses to food vs. non-food pictures viewing. While we found no significant differences in the overall meta-analysis, we show that age significantly influences brain response differences to food cues in the left insula and the left fusiform gyrus. In the left insula, obese vs. lean brain differences in response to food cues decreased with age, while in the left fusiform gyrus the pattern was opposite. Our results suggest that there is little evidence for obesity-related differences in responses to food cues and that such differences might be mediated by additional factors that are often not considered.

Keywords: Obesity, cue reactivity, food cues, meta-analysis, fMRI