Dec 03, 18 · Simply put, lean body mass is comprised of everything in your body besides body fat 1 Your lean body mass includes and anything else in our bodies that has mass and is not fat As an aside, for the average adult male about 42% of body weight is skeletal muscle and it's about 35% for femalesJust subtract the percentage from 100 For example, if you have 25 percent body fat, you have 75 percent lean body massSometimes defined as a body mass index between 25 and 299 Overweight Severely overweight, characterized by an excessive accumulation of body fat;
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