bmi takes into account mass (weight) and height. mass includes muscle fat and bone. so if someone has large bones or more muscle than fat this will not be taken into account. this is the key limitation of bmi. it is used a screening tool but should not be used as an indicator of health status. for more on bmi see how accurate is body mass index?
is bone structure ever taken into account with bmi? . i have extremely dense/large bone structure. i am never healthy at the weights the charts say i should be at. i do not have a typical women's structure. i feel the bmi charts are set for a petite woman and not for me.