His approximate weight will 169 lbs when he reaches his goal of 15% body fat, assuming that his lean body mass remains constant. Each of these categories has a unique biological significance and was probably subject to various selective pressures during the development of humans.
Body mass may be broken down into two main categories: lean mass, which includes muscle, organs, and bone, and body fat (energy reserves). The difference between a person's entire body weight and their weight in body fat is their lean body mass. Lean body mass is a crucial measurement for both health and fitness. Estimating your lean body mass is extremely helpful for monitoring your weight loss progress; but, since body fat is not metabolically active, it is advisable to consider your fat-free mass when dosing foods and medications.
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