Yes, this has always bothered me. Food is assigned different “calories” but they’re never burned by anything other than specific designated “exercise” activities. So if your Sim eats cake all the time but also goes for a jog once a day, they’ll be skinny. But if your Sim is running up and down the stairs doing laundry, playing with toddlers, going outside to garden, and working the “manual labor” job on weekends… even if their hunger is regularly yellow/red and they only eat one salad a day… they will get fat. Because there wasn’t time to do official exercise-for-exercise-sake and the game doesn’t count lifestyle or lack of food.
Then, to add insult to injury, the vast majority of the CAS looks terrible on them / clips / bulges oddly.
It horrified me so much at how quickly food items can change your sim, I ended up turning off body changes via MCCC. I click that off in MCCC on each sim as I come to play them. Some I have to edit in CAS after they've been in the game for a while without me ever having played them, because they managed to turn themselves into a complete foodwrecked couch potato.
I agree with the OP - the muscle gets laid on way too quickly from working out, and the fat does too (from any foods at all).
I remember my first character when I first played this game - had no idea this would happen and was quite confused at how their body was being messed with, and had to google at what was going on. The game doesn't tell you this will happen. I mean it makes sense, just it catches a new player by surprise - especially with how quickly it happens.
