In recent years there has been a back-and-forth discussion about whether being overweight is bad for your health. Intuitively one might think that being overweight is bad. But in 2015, for example, there was this article, which reflected a story making the rounds at the time:

https://qz.com/550527/obesity-paradox-scientists-now-think-t...

What I take this study to be saying is that obesity in itself is not really the problem, but it is (presumably) highly correlated with high A1C measurements and inflammation, which do indicate a poor state of the endocrine system (i.e., Type 2 diabetes), which can in turn lead to heart disease and stroke if not treated.

I'm hoping that someone who knows more than I do will poke some holes in what I have just written so as to give you a better answer.