Reintroducing plant foods after a carnivore diet stops diarrhea because plants are less potent bile stimulants than meat, and carbohydrates or fiber may reduce gallbladder contraction hormones.

“and the reason that when they reintroduce plant foods the diarrhea goes away immediately because when you reintroduce the plant foods it's not as much of a bile stimulant the coaly is just a kind in the hormones and our stomachs that influence the gallbladder to squeeze are probably not as robust when you have carbohydrates or other fibers in your diet”