While my game isnt exactly an idea, i am working on it already, but its public version does not have weight gain, I plan to make a game with rpg style no levels, a multitude of realistic things possible including but not limited to weight gain, pregnancy, and aging. if anyone wants to ask more feel free to pm me. 
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Good luck with the project! Show us the stuff when you think it’s at a good point to be revealed.
Will do, I will likely give the first build with weight in a month
Rlly hope you do well on your project!!
Thank you, I appreciate your support