Historians don't like when people talk about it, but the tipping coin goes in the ass. Source: pulled it out my ass

I've literally never seen a single person actually claim that about themselves. I've seen plenty of people point out the flaw of just using weight and height to diagnose others as overweight or obese, which is supported by literally all of the evidence in front of you. But I've never seen a conversation where someone's BMI somehow came up and they claimed that actually they're perfectly fit and it's a problem with BMI as a measurement. That's just not a thing that happens outside of the fantasies of fatphobic weirdos