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Is BMI an Accurate Way to Measure Body Fat?

https://www.scientificamerican.com/article/is-bmi-an-accurate-way-to-measure-body-fat/

scientificamerican.com

Is BMI an Accurate Way to Measure Body Fat?
Scientific American is the essential guide to the most awe-inspiring advances in science and technology, explaining how they change our understanding of the world and shape our lives.

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Body Mass Index (BMI)

Body Mass Index (BMI)

Body Mass Index (BMI) is a mathematical formula and divides a person's weight by the square of their height. The answer falls into one of eight categories and indicates the person's bodyweight, from very severely underweight to very severely obese. A high BMI can indicate a high body fat and be used to screen for possible health problems.

But BMI is not a perfect measurement and may actually overestimate or underestimate a person's body fat.

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Where BMI Goes Wrong

  • BMI doesn't distinguish between body fat and muscle mass. Muscle weighs about 18 percent more than the same amount of fat. So, according to BMI, the muscled person is more overweight than a sedentary person.
  • BMI is also not reliable to use on elderly adults, who continue to lose muscle and bone mass with age. An overweight older adult may appear to be within a normal BMI range.
  • The BMI calculation is based on Caucasian body types and may not be appropriate for people of other ethnicities.

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BMI Correlate to Health

A person whose BMI indicates they are overweight or obese is generally considered unhealthy. But 2016 research suggested that this was incorrect for 75 million Americans.

  • Researchers found that 54 million Americans that were classed as overweight or obese were perfectly healthy when they considered the cardiometabolic measures (blood pressure, blood sugar, cholesterol, etc.)
  • 21 Million people were classed normal in terms of BMI, but other cardiometabolic tests indicated they were unhealthy.

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