Only thing I can think of is Crusader Kings 2 and 3 to an extent. I have been working on a mod for CK2 to vastly expand the weight gain elements which can be found here: Crusader Kings 2 - 3.0's weight gain - #1050 by failmuseum
It has a medieval them, its technically stapled to a grand strategy game, and it’s not finished yet, but the base game free now (didn’t used to be). New update will be coming out shortly though, so you may want to hold off on downloading it if you’re interested.