Samoa Air has become the world's first airline to implement "pay as you weigh"

[Sgent]

56. Why is BMI wrong?

There is little evidence, and almost none when it comes to high quality studies, that body fat or muscle mass indicates a lower mortality rate given the same BMI as someone with a higher fat body make-up.

What is known without questions is that the higher the BMI, the more likely you are to suffer from various maladies including heart disease, diabetes, etc. Just because you are muscular now doesn't mean you'll always be (look at pro football players), and BMI is the best researched method we know of to quantify that risk.

That being said, there is some research and ongoing study about weight distribution being more important than BMI; however, the science is still out on that. What we know is that the higher your BMI regardless of reason, the higher your chance of weight related health issues.

It makes intuitive sense that a muscular person would have fewer issues, but without evidence its merely a hypothetical conjecture. Counter-intuitive items are a part of science every day.