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Why do prisoners put on weight?

From Willpower: Rediscovering the Greatest Human Strength

Clearly it’s not because of the irresistible prison cuisine. No gourmet chef is ever hired to cook when the clientele consists of customers who are literally captive. Yet men consistently come out of prison fatter than when they went in. The reason, according to Cornell’s Brian Wansink, is that prisoners don’t wear belts or tight-fitting clothes. In their jumpsuits and loose pants, they don’t get the little signals of weight gain that other people get when their pants feel tighter and their belts have to be loosened a notch

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