Small Changes, Big Results

How to Slim Down at Any Age

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Your 30s

"Women generally tend to lose about 1 percent of their muscle mass each year starting around age 30,” explains Riva Rahl, MD, medical director of the Cooper Wellness Program in Dallas. “That gradually slows your metabolism.” And because about three-quarters of women in their 30s have had at least one child, you may be juggling young children as well as a career.

Translation: You barely have a free moment to brush your teeth, much less focus on getting to the gym regularly. Happily, though, you can fight back—and win.

Next: Your 30s: Pick protein