Imayu, my sim ate a whole cake and a whole cheesecake in one sitting lol. Then I made her eat about four serves of lobster Thermidor the next day. I just make her eat and eat and eat. I think the problem is I originally made her with the boyish figure, no real waistline or hips. Which wasn't so bad, but then she got as skinny as she could, and as muscly as she could, and that was fine, but now she's an older sim (almost elder), she just looked wrong. So now she's lost the muscle and is a little bit bigger, she looks much better. I might have to use a potion on her. I'm sure next time I play a different household and go to the gym, she'll be there, and lose the little weight she's gained. Earlier in the game, when she was focusing on her career, she put on maximum weight, but even then she wasn't huge.