Aging
Beginning in the mid-20s, women lose an average of about 7 pounds of muscle mass each decade (compared to 5 pounds for men). To make matters worse, non-exercising women typically gain 1 -2 pounds of fat a year - for life. And the fat gain number can be much higher depending on lifestyle choices.

So, by your mid-40s, you have probably lost close to 15 pounds of metabolically active muscle and replaced it with over 20 pounds of lethargic fat – and that’s conservative! Your metabolism has dramatically slowed and your body composition has changed in unfavorable proportions.

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