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Fig. 5 —Body mass index (BMI) mapped against percentage body fat.
Data are divided by sex, and two trend lines clearly illustrate sex
difference. Men tend to have lower percentage body fat than women for same
BMI. Very lean subjects from cohort of athletes examined further lift trend
line for male subset because high muscle mass offsets low body fat and results
in relatively high BMI values in this group, situated at extreme left of
graphed data. Complexity of relationship between percentage body fat and BMI
illustrates shortcomings of BMI as reliable indicator of body fat. • =
men, 
= women, upper trend line = men, lower trend line = women.
