More than the Sum of Our BMIs | Patrick Basham and John Luik | Cato Institute: Commentary

More than the Sum of Our BMIs | Patrick Basham and John Luik | Cato Institute: Commentary: "The BMI is wholly arbitrary, having no scientifically valid relationship with mortality. It's inadequate as a measure of body fat because it cannot account for the composition of a person's body — fat, muscle, organs, water, etc. It's also affected substantially by a person's frame and the relative length of his or her legs and torso. And it does not take into account whether body fat is well-distributed or concentrated around the waist, the latter being more likely to indicate health risks."

"There is scant scientific evidence to support assertions by the federal government and others that being overweight or obese increases one's mortality risks, or that the overweight and moderately obese can improve their health by losing weight. Such claims ignore 40 years of international data suggesting that obesity is not a cause of premature mortality. Many studies have demonstrated that the effects of diet and physical activity are independent of the effects of BMI and other measures of body size or fat."

"Recent empirical analysis of the relationship between BMI and mortality found that death rates were essentially the same given BMIs ranging from 20 to 35. Normal-weight individuals of both genders do not appear to live longer than the mildly obese (those with BMIs of 30 to 35). This suggests that the only scientifically justified obesity interventions pertain to the small fraction of the population with BMIs of more than 40 (3 percent to 4 percent of adults)."