BMI ignores many factors, including age, ethnicity, sex, and the ratio of fat, muscle, and skeletal weight. It also disregards fat distribution and type of fat (visceral vs subcutaneous, brown vs yellow). A skinny fat person may have a perfect BMI while having way too much fat and too little muscle mass.Unfortunately, BMI does not take into consideration muscle mass. To me, and it's just me BMI is a cop-out so to speak as far as a metric goes. I like to monitor fat %, muscle mass, and cardio index as a barometer. We should have a better way than BMI IMO.
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