Thanks for all the replies & tips. Most of the time my Sims don't actually eat, unless they're Vampires and I'm trying to increase their power level through feeding. I use MCCC to auto fill needs, mainly due to my slow ar%e computer. If they do eat food it's like special occasions or if they have a day/night out a couple of times a week. Otherwise, no food intake, and they are exercising regularly (or at least they all have access to a home gym area). The weight gain doesn't bother me, it's just how quickly it's been happening. My first Sim gained weight over a period of about a 6 months in Sims time, like it crept up on her slowly, and then I just played a 'healthy lifestyle/get more exercise' type mini arc with her. It's only been recently that the weight gain (like really obvious weight gain) has been occurring in the space of 2-3 days.