Why Coffee Makes You Poop: Florida Gastroenterologist Explains

Many people feel the sudden urge to visit the bathroom after their morning coffee — but why does it happen? Gastroenterologist Dr. Joseph Salhab breaks down the science behind coffee’s effect on digestion and offers simple alternatives.

If you’re one of those people who can’t start their day without coffee — and also can’t avoid an immediate trip to the bathroom afterward — you’re definitely not alone. That post-coffee bathroom rush isn’t just coincidence; there’s real science behind it.

Florida-based gastroenterologist Dr. Joseph Salhab, who specializes in digestion, liver, pancreas, and nutrition, recently explained the phenomenon in an Instagram video posted on November 8. In the video, Dr. Salhab outlines how coffee affects your gut and shares three gentler alternatives for those who’d like to keep the energy boost without the sudden urge to “go.”

☕ Why Coffee Makes You Need to Poop

According to Dr. Salhab, around 30–40% of regular coffee drinkers experience a need to use the bathroom shortly after drinking their morning brew.

He explains that several factors contribute to this:

1. Caffeine’s effect on the colon:
   “Caffeine can stimulate movement of the colon within just four minutes of ingesting it,” says Dr. Salhab. This means your digestive system starts contracting soon after that first sip.
2. Gallbladder stimulation:
   Coffee also triggers the gallbladder to release digestive enzymes and bile, which in turn encourages bowel movement.
3. Temperature matters:
   Warm beverages naturally promote digestion. “Coffee is usually served warm, and warm liquids — even plain water — can stimulate bowel movements,” he adds.
4. Gut microbiome boost:
   The antioxidants in coffee encourage the growth of beneficial gut bacteria, which can influence how frequently you need to visit the restroom.

🌿 Gentler Alternatives to Avoid the Coffee Rush

If you love coffee but hate the side effects, Dr. Salhab suggests a few simple swaps:

• Reduce caffeine intake: Try green tea or half-caffeinated blends to lessen coffee’s laxative effect.
• Opt for cold brew or iced coffee: These tend to be less acidic and milder on the digestive system.
• Switch to decaf: You’ll still enjoy coffee’s antioxidants and flavor — without the urgent bathroom trips.

⚠️ Note to Readers:

This article is for informational purposes only and is not a substitute for professional medical advice. Always consult your healthcare provider for personalized guidance.