In male mice that are food-restricted, a low dose of semaglutide decreases normal food intake, but higher doses are needed to reduce interest in sugary rewards and change brain dopamine signals,...
Mechanism
Synthesis from 1 study
The drug makes mice eat less regular food by telling their brain they're full — even with a tiny dose. To make them stop wanting sugary treats, it needs a much stronger dose, and even then, it doesn't shut off the brain's pleasure signal — it changes how that signal works during eating. This...
Most probable mechanism
At low doses, the drug tells the brain's hunger center to feel full, so the mouse eats less regular food. At higher doses, it also affects the brain's reward system, making the mouse less interested in sugary treats — but oddly, it makes the reward neurons fire more when the mouse actually eats the sugar, not less. This means the drug doesn't just turn off pleasure; it changes how the brain responds to eating, and it needs more of the drug to do this.
Semaglutide binds to GLP-1 receptors in the arcuate nucleus and nucleus tractus solitarius, regions involved in energy balance and satiety signaling
GLP-1 receptor activation in these regions suppresses orexigenic neurons and activates anorexigenic neurons, reducing hunger drive and food intake
At low doses, this pathway reduces chow intake without affecting reward-related brain activity or behavior
At higher doses, semaglutide activates neural projections from the nucleus tractus solitarius, arcuate nucleus, or lateral septum to the ventral tegmental area
This increases dopamine neuron firing specifically during consumption of a rewarding stimulus, independent of changes in motivation or cue response
The increased dopamine activity during consumption coincides with reduced sucrose-seeking behavior, suggesting a dissociation between reward signaling and motivational drive
Evidence from Studies
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