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...
To gain wight, eat more that you need to. If you see the food need full, keep eating and you will start getting weight.
To lose weight, use the treadmill. No, pumping iron will not help. Specifically treadmill. Jogging also helps, but not much.
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