[naveen99]

by that logic, women would have more muscle mass then men, because they carry around more fat. Average american by definition is average. Overweight by definition is above average. BMI normal is outdated, just needs to move up.

[JumpCrisscross]

> Overweight by definition is above average

Not true. Overweight and obese are defined on fixed scales. You can have a population that is 100% obese.

[loeg]

> by that logic, women would have more muscle mass then men, because they carry around more fat.

No? You have to compare like for like. Sedentary obese women have more muscle mass than sedentary normal-weight women, and sedentary obese men have more muscle mass than sedentary normal-weight men. (And the ratio of women to men hasn't moved very much since 1924, and both sexes are heavier than they were in 1924.)

The rest of your comment is not responsive to mine.

[strken]

Why would BMI need to move up? Because it doesn't represent the average, or because it doesn't represent health?

I think the former is uncontroversial but boring, and the later is wrong. I also think that people conflate the two because they want to pretend that being average is the same thing as being healthy.