RL fatspo for writers: My doctor put me on prednisone (oral steroid). Data sheet said to avoid sugar, white flour, etc, which is good advice in general but I wondered why specifically with that drug. Nurse told me because of weight gain, and when I checked online, yeah, pretty much everyone who takes it plumps up. I laughed because I write WG fic and now here I was, in one of my stories lol.
I was short-term, just a week, now on the last day and I don't see/feel a difference. But I saw a lot of people online who were up as much as 100 lbs after a few months. Pair it with certain psych meds and RL would be more dramatic than most WG fic.