Oh, absolutely. Diet sodas don’t have sugar, but they have artificial sweeteners like sorbitol, xylitol, and Sucralose. These guys are notorious for their laxative effects.
Your body can’t digest these sugar alcohols very well, so they travel through your gut like foreign tourists in a rented car. They draw water into the intestine, which softens stool and speeds things up.
Think of it as the ghost of a sugar rush—with no calories, but all the gas and urgency. Some people call diet soda “colon cleaner in a can,” and honestly, that’s a pretty accurate job description.
The carbonation factor: bubbles of trouble
It’s not just the sweeteners—the bubbles matter too. Carbon dioxide in soda turns into carbonic acid in your stomach, which can irritate the lining.
Dr Pepper: The Poop-Inducing Soda Mystery | ShunKeto
This irritation can stimulate the gastrocolic reflex, which is a fancy way of saying your body goes, “Ah! Something weird is here! Empty the whole system!” It’s like a fire drill for your intestines.
Plus, all that gas can cause bloating and cramping, which pushes things along. So yes, even plain seltzer can make you poop if you’re sensitive. Sorry, La Croix lovers.
But here’s the tricky part: caffeine. Coffee gets all the credit for pooping, but soda’s caffeine also gives the colon a little tickle. A can of Coke has about 34mg—nothing crazy, but enough to rev the engine for some people.
Caffeine relaxes the anal sphincter and stimulates contractions. So when you mix caffeine, sugar, and carbonation, you’ve basically created a triple-threat pooping potion.
Not everyone reacts the same way, though. Some people could down a 2-liter of Mountain Dew and feel nothing. But for others? One sip and they’re asking for a map to the nearest restroom.
