Although a bit vague I believe your talking about a Japanese game called misekoya by not_shiranui. The game’s thread was closed due to the ages of characters featured in game.
It was a game about a young rich girl, her father wants her to learn how to run the family business within a year of her becoming an adult. So, you basically run a shop, fattening up your workers and this has an effect on some of the npcs in town as well.
The game featured an underage protagonist and another young girl, I think around 10+ that was abandoned on the street, that you were raising and she was also gaining weight like the rest of your employees under your management.