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Don'ts for a Flat Tummy

Skimp on shut-eye. Studies show that lack of sleep can boost levels of the stress hormone cortisol, which has been linked to ab fat.

Indulge in margarine. Research suggests the trans fats found in some margarines may prompt the creation of particular fat cells that tend to migrate to the midsection.

Smoke. As if smokers need more incentive to quit, multiple studies show that cigarettes, even as they cut appetite, prompt the body to deposit fat around the waist.

(Getty Images)

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