The Strange but Common “Supermarket Poop” Phenomenon
Have you ever walked into a supermarket and suddenly felt the urge to poop? You’re not alone. What started as a funny urban legend in Taiwan has now been confirmed as a global phenomenon. From Taipei to Melbourne, shoppers have shared the same experience: stepping into a big supermarket somehow triggers their bowels.
Doctors say this isn’t just in your imagination. In fact, there’s real science behind why shopping can make you want to use the bathroom—and it all comes down to your body’s “second brain.”
The Strongest Laxative
In Taiwan, countless online posts have joked that visiting chains always triggers the need to poop. Some people even claim it only happens at one specific supermarket, such as POYA or Carrefour. But this quirky habit isn’t limited to Taiwan. In Australia, one shopper admitted that every time they visited the large supermarket chain like Bunnings, they had to rush to the toilet. Others agreed, joking that “Bunnings is the strongest laxative.”
So why does this happen in different countries, cultures, and supermarkets?
The Science: Your “Second Brain” in the Gut
Dr. Zac Turner, a physician practicing in Sydney, explains that the phenomenon is linked to the Enteric Nervous System (ENS)—often called the body’s “second brain.”
- The ENS is a vast network of nerves lining the gut.
- It communicates constantly with the brain through the vagus nerve.
- When stimulated by sensory triggers—like smells, sights, or even stress—the ENS can send signals to the intestines that it’s time to activate bowel movements.
In other words, your brain and gut are “talking,” and supermarkets might provide just the right mix of signals to set things in motion.
Why Do Supermarkets Trigger the Gut?
Scientists suggest several possible triggers:
- Smells and sensory overload
- Fresh produce, cleaning supplies, baked goods, perfumes—supermarkets are full of strong scents that stimulate the gut.
- Stress and psychological cues
- The act of shopping itself, with crowds, bright lights, and decision-making, may trigger a stress response that activates the bowels.
- Physical movement
- Bending down to pick items off shelves, pushing carts, or lifting heavy bags can also stimulate the intestines.
This combination of sensory stimulation + body movement + gut-brain signals could explain why supermarkets are such a common “toilet trigger.”
The Gut-Brain Axis: More Than Just Poop
The supermarket bathroom phenomenon is just one example of the gut-brain axis—the powerful two-way communication between the digestive system and the central nervous system.
- Stress can lead to stomach aches or diarrhea.
- Anxiety often triggers an urgent need to use the toilet.
- Pleasant smells, like coffee or fresh bread, can stimulate digestion.
Understanding this connection may help people manage not only funny moments in supermarkets but also serious gut conditions such as irritable bowel syndrome (IBS).
Should You Be Concerned?
Most of the time, the “supermarket poop” effect is harmless. In fact, it might even be a sign that your gut-brain connection is working well.
However, if you find that the urge to use the toilet happens too often, comes with pain, or stool color looks unusual (black, red, or pale clay-like), it may be worth consulting a doctor to rule out digestive problems.
A Funny Habit With Real Science Behind It
What started as an internet joke has revealed something fascinating about human biology. The next time you feel the urge to poop while shopping, you can thank your body’s “second brain”—your gut.
It’s a quirky reminder of just how closely connected our digestive system and brain really are.