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Fat Versus Sugar, Impulsivity, and the VTA-to-Cortex Circuit
More recent rodent work has refined this picture in two directions. First, VTA amylin-receptor activation appears to modulate mesolimbic dopamine differently depending on whether the reward is fat or sugar, suggesting the circuit is not a uniform “reward off s
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- More recent rodent work has refined this picture in two directions. First, VTA amylin-receptor activation appears to modulate mesolimbic dopamine differently depending on whether the reward is fat or sugar, suggesting the circuit is not a uniform “reward off switch” but a nutrient-sensitive modulator.[8] Second, amylin has been shown to act on a ventral-tegmental-area-to-medial-prefrontal-cortex circuit to suppress food intake and, notably, to reduce impulsive food-directed behavior — connecting amylin signaling to cognitive control over eating, not just to raw consumption.[9] These findings are why amylin analogs are discussed in the context of reward-driven and even impulsive eating, but again they are rodent mechanistic studies; extrapolating them to human eating-behavior claims is not warranted, and cagrilintide must never be framed as a treatment for eating disorders.