Parameters such as body volume index are better determinants of obesity measurement in such cases. People who are very fit will have an inaccurate BMI because their high muscle mass will categorize them under the overweight class. It is seen that those in the BMI range 20-30 comes under a wide range of body fat percentages. ![]() Studies indicate that this parameter is better in determining if a person is not obese rather than determining if a person is obese. Similarly, in the case of the people with lean body mass, the excess adiposity is underestimated. If we consider the example of people with more lean mass such as the athletes, BMI makes an overestimation of their adiposity. The fat mass and muscle mass distribution assumptions are never accurate. It uses natural scaling of mass with the third power of height to attain realistic results, unlike BMI. There is another parameter named Ponderal Index or Corpulence Index that was initially started by Swiss physician Fritz Rohrer. This indicates the unreliability of the parameter in measuring the fat level of an individual. It actually becomes double, which implies an unusually high BMI for taller people. The BMI of an individual doesn't remain the same if we double the body dimensions, as mass scales with the cube of height. Overweight and obesity issues are generally seen among Americans and is the least in Southeast Asia.
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