Chicago rats fed a diet of sausage, pound cake, bacon, cheesecake, and Ho Hos began to behave like rats addicted to heroin, consuming increasing amounts of food to feel satisfied and continuing to eat even when to do so meant that electric shocks were delivered to their tiny paws. When switched to healthful food (“the salad option”) the rats, which had become obese, their brains numbed by junk, simply refused to eat.

Weekly Review—By Paul Ford (Harper’s Magazine)

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