The Fat Trap Reaching for a third helping? Palmitic acid, a type of saturated fat in butter, cheese and red meat, blocks satiety hormones and increases appetite, new research shows. "After three days of eating this type of fat, your brain pays less attention to the signals to stop eating," says Deborah J. Clegg R.D., Ph.D., assistant professor of internal medicine at University of Texas Southwestern Medical Center in Dallas. The fix? Choose nonfat cheese and swap butter for olive oil, which contains oleic acid and won't impair your fullness switch. Fitness Magazine
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