That's one reason why so many people like to drink coffee as breakfast or after meals. It is an intestinal stimulant and they're more alert after they clear their bowels.
And some people are like guinea pigs. They can't take a dump until they put something in their stomach, and warm drinks work as well as food. This seems to have evolved, so that humans eat and poop at home or on breaks while traveling, to help coordinate potty breaks as a group and prevent them from getting picked off by predators.
Okay, TMI. 🤣🤣 This is turning into an episode of Dr. Colon.