Eat more bananas
They're full of potassium, which revs up your metabolism by regulating your body's water balance, says vitamin expert Susan Lark, M.D., author of The Lark Letter. If you're dehydrated, you'll burn fewer calories. Make sure you're getting at least 2,000 mg: a banana has 450 mg, a cup of milk has 370 mg and an orange has 250 mg.
Get enough z's
Yeah, Russell Crowe may be on Letterman, but it's way more important for your waistline if you don't stay up. A study at the University of Chicago Medical Center found that people who got only four hours of sleep had much more difficulty processing carbs. The culprit? Increased levels of insulin and the stress hormone cortisol. "When you're exhausted, your body lacks the energy to do its normal day-to-day functions, which includes burning calories efficiently," says Talbott. So the best way to make sure your metabolism runs smoothly is to get six to eight hours of shut-eye each night.
Read more: 21 Ways to Burn Fat Faster - Redbook