I think the most worrisome thing about there not being fat bodies is that Larian won't comment on the topic. Have they not seen us ask about it? It's been in several feedback threads on at least the BG3 subreddit since early EA, and it was already a struggle to ask for inclusive pronouns here and on other sites considering husky characters are what seemingly would be an obvious inclusion (as other games include, if nothing else, larger bellies).
I play on PS5, so I won't have access to any mods for chubby bodies. None of the ones in-game that I know of are portrayed in a, for lack of better words, neutral way. There are 2 bigger bodied characters who play tabletop RPGs that I REALLY wanted to recreate in BG3.