☕ Why Does Coffee Make You Poop? Feeling the urge to use the bathroom after your morning coffee is a common and completely physiological response. Coffee increases stomach acid secretion, stimulates colon contractions, and activates the gastrocolic reflex. This reflex simply means that when food or drink enters the stomach, the intestines become more active. Importantly, this effect is not caused by caffeine alone. Other bioactive compounds in coffee can also stimulate bowel movements. That’s wh