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Scientists are discovering that fast food can trigger hormonal changes in the body that make them hard to resist. Fatty foods may activate the brain’s dopamine system—similar to the effects of an addictive drug. Over time, as the body weight increases, people become resistant to the effects of the hormone leptin, which is linked to weight and appetite. (FYI: A typical school lunch has 50 percent more fat grams than a typical bag lunch brought from home.)

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Reprinted with permission from Vibrant Life, November/December 2006. Copyright © 2007 by GraceNotes. All rights reserved. Use of this material is subject to usage guidelines.

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