An addict's motivation to take drugs and a hungry person's motivation to eat use similar circuits in the brain, research indicates. That doesn't mean food is addictive, but certain foods do act a lot like a drug in the brain and can alter the brain the way drugs do.
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Full story at http://www.npr.org/2010/11/30/131698228/overeating-like-drug-use-rewards-and-alters-brain?ft=1&f=1001
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