Maybe you've been struggling -- without success -- to get down to the size you were in high school or on your wedding day. But do you really need to go that low? The truth, experts say, is that you can weigh more than your ideal weight and still be healthy (not to mention happy).

Your Weight "Set Point"

Just as your body temperature is programmed to stay around 98.6 degrees, your body weight is naturally regulated to stay within a range of 10%-20%, says Thomas Wadden, PhD, director of the Center for Weight and Eating Disorders at University of Pennsylvania Medical School. This weight range is known as the "set point."

A complex set of hormones, chemicals, and hunger signals help your body naturally maintain your weight within this range, says American Dietetic Association spokeswoman Dawn Jackson Blatner, RD.

It is not just a matter of genetics, though. Your eating and exercise habits can also help to determine your set point.

"Overeating swamps the internal regulatory system, and, as a result, the set point increases -- which is much easier to do than it is to lower it," says Wadden. The body adjusts to the higher weight and "resets" the set point to defend the new weight.