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In fact, it can take 1-2 days before food finishes its journey through a person’s digestive tract. Therefore, a person who poops shortly after eating is likely to be passing food that they ate a day or two earlier.

The most likely cause of needing to poop right after eating is the gastrocolic reflex. This reflex is a normal involuntary reaction to food entering the stomach. However, the intensity of the gastrocolic reflex can vary among individuals.

Why does it happen, and is it normal?

The gastrocolic reflex, or gastrocolic response, is a normal involuntary reaction to food entering the stomach.

When food enters this organ, the body releases a hormone that causes the colon to contract. These contractions move previously eaten food further through the digestive system, which can result in the urge to pass stool.

For some people, the gastrocolic reflex is mild, causing no symptoms. For others, the gastrocolic reflex is intense, and the urge to poop after eating can be particularly severe.

Conditions that can affect the gastrocolic reflex

Certain health conditions can affect the gastrocolic reflex. For example, irritable bowel syndrome (IBS) can cause a person’s digestive tract to move food through their system at a much faster rate.

Other conditions that could cause a person to pass stool more quickly than average include:

  • food allergies and food intolerances
  • anxiety
  • gastritis
  • celiac disease
  • inflammatory bowel disease (IBD)
  • Crohn’s disease

Each of the above conditions may increase the intensity of the gastrocolic reflex, resulting in an urge to poop soon after eating. They may also give rise to additional digestive symptoms, such as:

  • bloating that subsides after passing gas or stool
  • a frequent need to pass gas
  • abdominal pain or discomfort
  • mucus in the stool
  • diarrhoea
  • constipation
  • alternating diarrhoea and constipation

When to see a doctor

The gastrocolic reflex is a normal reaction to food entering the stomach. In most cases, feeling the urge to poop after eating does not warrant a visit to the doctor.

However, a person should see their doctor if they experience the following:

  • intense and frequent gastrocolic responses to food
  • diarrhoea lasting longer than 2 days
  • additional gastric symptoms

The above symptoms could indicate a possible underlying health issue.

Treatment and prevention

As the gastrocolic reflex is a normal bodily reaction, it does not technically require treatment. However, there are steps that people can take to help reduce the intensity of the gastrocolic reflex and the associated urge to poop.

While speaking to My Medical Mantra, Dr Amit Gharat, a gastroenterologist working in Mumbai, said, “If there is an infection then this problem can occur, it is known as a gastrocolic reflex. Irritable bowel syndrome or other stomach problems can cause this. This is not a serious illness. Infections can be addressed with medications.”

Dr Prajwali Sonkamble, a general physician, “If you pop after eating you can be suffering from indigestion. Waste matter accumulated in the stomach from several days can cause this. People with acidity are prone to this problem. This condition can occur at any age. It is not a serious problem, but if the problem remains for a long time it can be critical. Indigestion can cause gastritis. If you notice blood while pooping visit a doctor as soon as possible.”

Seek treatment for underlying digestive conditions

People should see a doctor if other gastric symptoms accompany the urge to poop after eating.

Depending on the duration and severity of these symptoms, a doctor may carry out tests to diagnose any underlying health conditions.

If a condition is present, treating it may help reduce the intensity of the gastrocolic reflex.

Changing the diet

Some foods are more likely than others to cause an intense gastrocolic response. These include:

  • fatty or greasy foods
  • dairy products
  • foods high in fibre

Keeping a food diary can help a person identify foods that may be intensifying their gastrocolic response. The diary should contain a record of the foods that the person eats, as well as their digestive response to the foods.

Once the person has identified a possible trigger food, they should temporarily avoid the food to see whether their symptoms improve.


Passing stool immediately after a meal is usually the result of the gastrocolic reflex, which is a normal bodily reaction to food entering the stomach.

Almost everyone will experience the effects of the gastrocolic reflex from time to time. However, its intensity can vary from person to person. Certain lifestyle factors can help reduce the urge to poop following a meal.

People should see a doctor if they frequently experience diarrhoea or other gastric symptoms following a meal. These symptoms could indicate an underlying health issue that requires medical attention.

Source: Medical News Today 

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