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Why is it more difficult for women to lose weight, and easier for us to gain weight, as we hit midlife? Let's figure it out. 

While changing hormone levels play a role, a major culprit in midlife weight gain is the loss of muscle mass that naturally comes with aging, a condition called sarcopenia. If you're physically inactive, you can lose as much as three to five percent of your muscle mass each decade after age 30. 

So unless we take action to preserve and build lean muscle mass, the lost muscle is replaced by fat, our bodies require fewer calories (muscle burns more calories than fat), and...