Salty foods may in fact act as an antidepressant, the brain's way of rewarding us for staving off extinction. And just as with any addiction, the brain doesn't know when to turn it off -- the pleasure centers of your brain get accustomed to the high, demanding more and more. And, just to make things even worse, salt may actually contribute to changing our brain chemistry, so that instead of feeling full after eating, we just keep craving more. Combining it with fat and other elements in junk food is actually thought to be about as addictive as heroin.

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