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Animals and humans are motivated to consume high-fat, high-calorie foods by cues predicting such foods. The neural mechanisms underlying this effect are not well understood. Objective:  We tested the hypothesis that cues paired with a food reward, as compared to explicitly unpaired cues, increase rats’ food-seeking behavior by potentiating dopamine release in the nucleus accumbens, and that this effect would be less evident under satiety. Methods:  We used a simple discriminative stimulus task and electrochemical recordings of dopamine release in freely moving rats. Results:  We found that both food-predictive cue and hunger increased conditioned approaches to the receptacle (food-seeking behavior indicated by movement to the food receptacle). In addition, we observed dopamine release when the food-predictive cue (but not the unpaired cue) was presented, independent of hunger or satiety. Finally, we found a positive correlation between dopamine release amplitude and the number of conditioned approaches to the food receptacle in the sated condition, but not in the hungry condition. Discussion:  Our results suggest that dopamine could drive seeking behavior for calorie-dense food in absence of homeostatic need, a core aspect of binge eating disorders.

Stimuli predicting high-calorie reward increase dopamine release and drive approach to food in the absence of homeostatic need