Brain activation to high-calorie food images in healthy normal weight and obese children: a fMRI study.

BACKGROUND: Understanding how normal weight and obese young children process high-calorie food stimuli may provide information relevant to the neurobiology of eating behavior contributing to childhood obesity. In this study, we used fMRI to evaluate whether brain activation to high-calorie food images differs between normal weight and obese young children.

METHODS: Brain activation maps in response to high-calorie food images and non-food images for 22 healthy, 8-10-years-old children ( N  = 11/11 for normal weight/obese respectively) were generated and compared between groups.

RESULTS: When comparing brain activation differences in response to viewing high-calorie food versus non-food images between normal weight and obese children, group differences were observed in areas related to memory and cognitive control. Specifically, normal weight children showed higher activation of posterior parahippocampal gyri (PPHG) and dorsomedial prefrontal cortex (DMPFC). Further ROI analyses indicated higher activation strength (Z scores) in the right PPHG ( p  = 0.01) and higher activation strength ( p  < 0.001) as well as a larger activation area ( p  = 0.02) in the DMPFC in normal weight than obese children.

CONCLUSIONS: Normal weight and obese children process high-calorie food stimuli differently even from a young age. Normal weight children exhibit increased brain activation in regions associated with memory and cognitive control when viewing high-calorie food images.