1. BMI is a quick calculation, based on the fact that generally most of us have an ‘average amount of fat and muscle, but it was never intended to determine fitness or even really fatness as the only measure. It was thought up by a mathematician, and not based on scientific studies initially.
2. It is scientifically nonsensical without measuring waist size, relative waist and the waist size. Women should not be over 88 cm in their waist and men should not be over 94. Waist to hip ratio is probably more important than the overall waist size.
3. BMI calculations alone are physiologically wrong without knowing muscle and fat proportion, as BMI makes no allowances for muscle and fat proportion in the calculation.
4. BMI gets the logic wrong although our own CDC says it is a reliable indicator in body fatness.
5. BMI only calculations are bad statistics as it assumes low muscle mass.
6. BMI confuses by scientific authority as most people do not know it is not measuring their fatness.
7. BMI wrongly suggests there are distinct categories of underweight, ideal, overweight and obese, with sharp boundaries that hinge on a decimal place, but it’s really more gradual than that.
8. Continued reliance on the BMI means doctors don't feel the need to use one of the more scientifically sound methods that are available to measure obesity levels.
9. BMI is a reasonable measure of trends, as your height won’t change, and you don’t really know if you are adding muscle or fat other than guessing based on fit of clothing and caliper pinching!
10. BMI testing should be replaced by a combination of weight, body composition and waist measurement! And that’s what we recommend for our dieters!
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