I’ve been thinking about this for a while, and it seems quite strange no one has really brought up this idea to any large capacity: There should be a weight gain game centered around a more empire management or sort of interactive novel involving royalty. Something in the vein of a more simplistic Civilization or even Paradox title seems suited- with just much more of a focus on the individual player character, similar to Crusader Kings 2, just taken to even more of an extreme. It could even be an RPG in a sense, with you playing as a variably despotic and tyrranical ruler with quite the appetite that only increases over time.
It’s a natural fit for WG. You would have plenty of access to food, plus some extra substance in the form of the empire building mechanic, which can directly tie into how much you can afford, whether it be food, expensive clothing, jewelry, or upgrades to certain parts of your empire like buildings and equipment for your armies.
Overall, I would like to see a game with a fat, domineering, selfish ruler type who only cares about themselves and getting more. I could see pampering, feeding, and all sorts of different events abound, some good, some bad that come with being a ruler with such vices and a personality type. I feel as if it would make a great dynamic for an interesting game.