Gaining

Bears put on an enormous amount of weight before winter, and yet suffer no obesity related health issues. Apparently scientists theorise that this is because of a gut bacteria that allows it to gain weight without the negative effects of heart disease and diabetes. Mice exposed to this bacteria gained weight and yet showed no negative side effects from the accumulated fat phys.org/news/2018-04-gut-bacteria-healthily-obese.html.

It'd be great if a similar thing could be done in humans, though I doubt there'd be much market for it since most people wouldn't want to get fat, even if it meant no noticeable health issues. Though that does make me think if some types of probiotics could be useful for weight gain, I think I remember seeing a post like that on this site.

Edit: Found the post phys.org/news/2018-04-gut-bacteria-healthily-obese.html. But that was suggesting gaining weight through insulin spikes, and just using probiotics to support a healthy gut. Which I've tried, and the spikes really do work; they make you really hungry and put on pounds quickly. You just have to space it out and avoid all other high gi foods so that you don't get diabetes (bodybuilders do this except to put on muscle instead of fat).

I don’t know if it’s a good idea to mess with your gut microbes for the sake of gaining weight. You can get really sick messing with them. At least for me, it’s been super easy to gain fat.. literally try eating everything to your hearts content b4 trying that… but obviously it’s your body and you can do what you want with it and you’re an adult you can do your own research and what not