BMI takes no actual health factors into account. It can’t tell you anything about your blood pressure, your glucose levels, your hormones, your metabolism, your strength, your stamina, your bone density, your cholesterol, your immunity, your cellular respiration . . . nothing. It’s literally just a math equation: weight in relation to height, and it was first published by a life insurance company in 1959 as a way of explaining their rates. This was criticized by scientists because the equation it was based on was never meant to be used for individual diagnosis.

