Read the article...I'd rather shit myself than take a poo pill.Depends on your gut flora composition, which is a factor of diet and genetics.
There are cases of a lifelong slender woman receiving a stool transplant (for medical treatment) from a chubby woman, and the slender woman became chubby while making no changes to diet or exercise.
Edit, found it: https://www.iflscience.com/health-a...bese-after-fecal-transplant-overweight-donor/