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You should read "The Hungry Brain" [0]. It's by a neuroscientist, who explains the deep ways that the appetite mechanism is wired into just about every area of our brain, making "willpower" very hard to sustain. As just one example, prisoners placed on a forced starvation diet became obsessed with cooking implements. It also provides strong evidence that physiological mechanisms (not conscious choices) are behind appetite differences and fat mass variations in the population.

[0] https://www.amazon.com/Hungry-Brain-Outsmarting-Instincts-Ov...

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