100 IQ is the norm, sure, but why obesity?

100 IQ is a defined norm. It's a calibration.

Obesity is a statistical trend in America. 2/3rds of Americans are "overweight" or "obese"[0] according to widely used metrics.

[0] - https://www.niddk.nih.gov/health-information/health-statisti...

For IQ, in fact, I agree. That one accepts obesity as normal is telling (not everyone here is American, you know?)

I wasn't saying that I do or that anyone ought to accept obesity as normal. However, in my country (I'm an American) it is prevalent. I'm overweight (though not obese) too. It's not that weird to view it as typical. The word "norm" can be construed in a lot of ways. In one sense it just means typical or average or median. In another sense it means normative or preferred. I think we know what sense of the word we're dealing with here though.

Completely stealing this for future use.

This is the most elegant comment I've seen in a while. Well said.