"Since this is a cross-sectional study, we don't know which came first – what this study doesn't tell us is whether the person who is obese and active got active when they found they were obese and you did Risk factors were high? Or were they active and still they became obese and their risk factors increased? ”Pencina, who was not part of the study, added.
If I learned anything in my econometrics course, it's called endogeneity, where x causes y and y causes x and pretty much means the study's results are wrong. How wrong it is is impossible to know, but from my point of view what is presented here is extremely dubious at best.
To edit: Here is the latest study