The results of a study published this year in the American Journal of Clinical Nutrition on the relationship between body fat mass and fat-free mass and total mortality proved that BMI isn’t a reliable indicator of wellbeing or physical fitness. In the research, larger levels of fat mass were linked to a 50% higher risk of death compared to lower levels of fat mass. To put it another way, greater muscularity is linked to a lower chance of death. The effect of your muscle mass on your health may not be determined solely by measuring your body fat.
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