Those both make sense.
Here is a FR thread about a woman became obese after fecal transplantation from overweight donor: https://freerepublic.com/focus/f-chat/3254780/posts
That is very interesting. I kind of went on a semi deep investigative dive on being a fecal donor. I learned you have to be in absolutely excellent shape, think athlete type in shape, & young. So it was surprising that someone got a fecal transplant from an obese person.