potential food shortage—leptin levels are low. The relative absence of leptin’s message tells the brain, “I don’t have enough body fat!” Your brain then tells you to eat more and move less, which serves to change your behavior until your body fat is within a safer range. You become hungrier (and probably eat more), your metabolism slows down

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Ventral medial hypothalamus: control station for hunger, eating and satiety through multiple populations of neurons, which respectively control hunger and satiety.