If you often feel a need to poop straight after eating, you might wonder what this means. A doctor has explained that this common phenomenon is linked to a natural bodily process called the gastrocolic reflex. While it may seem like the food is passing through your digestive system instantly, there’s a scientific explanation behind it.

Understanding the Gastrocolic Reflex

The gastrocolic reflex is a physiological response that occurs in your lower gastrointestinal (GI) tract after eating. According to experts, this reflex is entirely normal and helps your body prepare for more food by stimulating bowel movement.

As Dr. Salhab explains, when you eat, your stomach stretches, sending signals to your brain. In turn, your brain signals your colon to contract and create room for the incoming food. The stool and water that your colon expels after eating are actually from previously digested food, not the meal you just ate.

Why the Reflex May Be Heightened in Some People

For some individuals, especially those diagnosed with irritable bowel syndrome (IBS), the gastrocolic reflex can be particularly intense. IBS is a condition that affects the gastrointestinal tract and can cause symptoms such as abdominal pain, diarrhea, gas, bloating, and constipation.

Dr. Salhab notes that for people with IBS, the colon’s contractions can be unusually forceful and may result in significant discomfort or even diarrhea immediately after meals. This heightened sensitivity of the gastrocolic reflex is one of the factors that makes IBS challenging to manage.

Managing Symptoms of an Overactive Gastrocolic Reflex

If you frequently experience discomfort or urgency to use the restroom after eating, there are some steps you can take to ease your symptoms. Dr. Salhab recommends avoiding certain trigger foods that may exacerbate the issue, such as: