An irrational fear of caffeine addiction turns some people against coffee, says Marcia Pelchat, a food researcher at Monell Chemical Senses Center in Philadelphia.

费城莫内尔化学药品识别中心的食品研究员玛西娅·佩尔沙说，有些人因为害怕咖啡因上瘾而拒绝喝咖啡，而这一想法是不合理的。

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Ms. PELCHAT: So you get a little high from release of these chemicals.

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Pelchat adds, however, that while we're born with certain cravings, there's also evidence we start to crave whatever we eat in large quantities.

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"It's analogous to a drug addict who's gone through rehab, but when he walks by that abandoned crack house he suddenly thinks about going in again, " Pelchat says.

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