Well can they? I don't remember them ever doing that before but a couple times I've played a Sim, I've noticed their body looks different after a couple days or so. That is happening with my current S...
treadmill and jogging for weightloss and the workout machine for buildung muscles. also i heard that if your sim eats gourmet meals then they don gain that much weight because they have less calorira but i dont know if this is true