When you work out and the pounds still don't come off, Prevention magazine has some tips on why. When Australian and UK researchers reviewed nearly 100 studies on exercise and weight loss, they discovered four ways to turn the tide.

1. Make some extra muscles. After 40, your body's metabolism begins to decline at a rate of 2 to 4 percent per decade, and weight loss can slow it down even more. In a University of Colorado Health Sciences study, losing a pound a week for 12 weeks lowered ...

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