Want to Keep Your Metabolism Revved?

Make sure you get enough calories each day. If you don’t, your body will sense the danger of starvation and actually slow down your metabolism, says Mark Hyman, MD, author of Ultrametabolism (Simon & Schuster, 2008). A quick way to figure out how many calories you need every day: Calculate your resting metabolic rate. An average person’s rate is about 10 times his or her weight in pounds. So if you weigh 150 pounds, don’t eat fewer than 1,500 calories a day.