I originally got into this after nearly being hospitalized for being too underweight, which is an issue I’ve struggled with for most of my life due to an eating disorder. The idea of getting very fat is something I find sexy which is definitely a big part of why my ultimate goals are as big as they are (if it was exclusively for health reasons I’d only want to be about 170, which would still be nearly twice my lowest adult weight, but my actual long term goal is more around 250), but really a lot of the reason I want to gain a lot of weight is because it will give me some insulation against something like that happening again. If you’re 200 pounds and lose 25 pounds due to having an episode in which you’re unable to get anywhere near the amount of calories you need for a while because food just doesn’t seem edible, that’s still not good, but it’s much better than being 100 pounds and having that same thing happen. Of course, this also means that gaining has been difficult for me because I have trouble consistently eating enough to gain any weight, but I have managed to gain about 30 pounds over the few years since I started trying.
4 years