I remember old Sims games having this feature. Eat a lot and don't do sport? Your sim gets fatter. Do sport and eating healthy? Your sim gets fitter. While it isn't a 100% accurate to real life, it was a neat feature for a life sim, as it allowed for variety in the sim population and it promoted objectively healthy behaviour. I honestly don't think this kind of feature is harmful for anyone, unless you are the kind of people who think video games is a mirror of real life like the people who though violent video games make people who play them violent too.
Bottom line is, is this feature worth adding to BG3? Eeeeh... I have never seen a DM tracking weight in a tabletop session, so I wouldn't miss it.
