Scholars are concerned that very little evidence has been produced regarding the question of exactly how body fat is supposed to cause disease (1). With the exception of osteoarthritis, where increased body mass contributes to wear on joints, and a few cancers where estrogen originating in adipose tissue may contribute, causal links between body fat and disease remain hypothetical. Researchers are asking health professionals and policy makers to consider whether it makes sense to treat body weight as a barometer of public health. Despite this shaky foundation for defining physical health in terms of body fatness, much of current health and communication research measures health through simple measures of a person’s body fat, and that may be doing more harm than good for the health status of this country.
This page is very well researched and insightful. The BMI is being used in ways it was never meant to be used. And the current standards used with the BMI were made up by life insurance companies. The page is well worth a read.