Much has been written about the psychological aspects of obesity. Among its many functions the diencephalon is also the seat of our primitive animal instincts, and just as in an emergency it can switch energy from one center to another, so it seems to be able to transfer pressure from one instinct to another. Thus, a lonely and unhappy person deprived of all emotional comfort and of all instinct gratification except the stilling of hunger and thirst can use these as outlets for pent up instinct pressure and so develop obesity. Yet once that has happened, no amount of psychotherapy or analysis, happiness, company or the gratification of other instincts will correct the condition.
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