Weight gain in the Sims is wild. Carl did a breakdown a while back. Additionally I've read that a Sims hips will get a bit wider and they gain a bit of weight after the birth of each child. I can't confirm that though. Honestly your sim may just be eating richer foods or is less active than during the last pregnancy causing the weight gain. Exercise does help to keep the weight off but they do gain weight if you play on particular Sim a bunch. So then I use Cas.fulleditmode shift click the Sim in question and go into CAS and make them to the original proportions I gave them. I love The Sims but this is a little irritating that they gain weight so easily. This mod has been designed to force your sims to adopt a diversified diet. Some foods induce weight gain, others induce weight loss, and very few are 0 calorie. This means that your sims have a much lower risk of being overweight, unless if they like junk foods and desserts too much. But if they like only salad, they risk being underweight on Diff foods have diff calories in the Sims. Eat stuff with salad or fish. Fish tacos etc. Working out makes them lose weight too and if you cool kitchen pack and lvl 5 cooking you can make diet ice cream which makes them lose weight fast. 13. Sims 4 Weight Loss Mod. The Sims 4 No Fatness Mod/ No Muscle Mod is an og mod that was created by Scripthoge, way back for the issue of Sims gaining weight so quickly. This fantastic mod eliminated that weight gain issue caused by lack of exercise and food consumption! Plus, if you’re worried about packing on muscle and getting too toned, you Weight Gain Viruses These viruses put sims in a blissful state, make them need to eat more to get full, make them lazier, and they constantly gain weight. Chubvirus (only effects males young adult- elder) Curvitis (only effects females young adult-elder) Grovirus (effects all sims young adult-elder) Muscle Growth Viruses These Sims gain powerful Moodlets from Viewing works of art and can Admire Art and discuss art in unique ways. Bookworm: These Sims gain powerful Moodlets from reading Books and can Analyze Books and Discuss Books in unique ways. Bro: These Sims can Bro Hug other Bros, gain Confidence around other Bros, become Energized from Watching Sports i’ve been playing the game for awhile and honestly the way gaining weight works is so weird in general. like for example if you eat wait before their hunger bar turns yellow they’ll gain weight even if it’s like one tiny sliver away from turning yellow. also certain traits or lifestyle makes them gain weight faster. the foodie trait will do that i think. honestly just eat dessert every Ur5r.