As few of us have the physique of a heavyweight boxer, BMI is a very useful way of identifying those of us who could do with losing some weight. One could rubbish BMI on the basis of calculations carried out on two men with obviously high levels of physical fitness, and ignore a high personal BMI when one is a plump, middle-aged man with a sedentary lifestyle. Every smoker knows of someone who smoked 40 a day and lived to 100. But who are you trying to kid?
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