How Gut Bacteria Can Affect Your Bowel Movements
Share
Constipation is a common problem. It usually means having fewer than three bowel movements per week, passing hard stools, or feeling that your bowels do not empty completely. Most people think constipation happens only because of low fiber intake, less water, or lack of exercise. While these factors are important, new research shows that certain gut bacteria may also play a role.
A recent study titled Bacterial constipation: Mucin-degrading intestinal commensal bacteria cause constipation suggests that specific bacteria in the gut may reduce the natural lubrication in the colon and contribute to constipation .
What Is Mucus and Why Is It Important?
Inside your large intestine, there is a layer of mucus. This mucus acts like a natural lubricant. It helps stool move smoothly through the colon and protects the gut lining.
Mucus is made mainly from a substance called mucin. Mucin holds water and keeps stools soft and moist. When there is enough mucus, bowel movements are easier and more comfortable.
If mucus is reduced, stools can become dry and hard. This can slow down bowel movements and lead to constipation.
How Gut Bacteria Affect Mucus
Your gut contains trillions of bacteria. Many of them are helpful. However, some bacteria can break down mucus.
The study found that two specific bacteria were increased in people with constipation:
- Akkermansia muciniphila
- Bacteroides thetaiotaomicron
On their own, each bacterium did not cause constipation in animal models. But when both were present together, they worked as a team to break down the mucus layer more strongly .
This reduced the amount of mucus in the colon. As a result:
- Stool lubrication decreased
- Stool water content dropped
- Bowel movements became harder and less frequent
The researchers called this condition bacterial constipation .
Why This Matters for People With Chronic Constipation
The study looked at people with Parkinson’s disease and chronic idiopathic constipation. Both groups had lower levels of fecal mucin and higher levels of these mucus-degrading bacteria .
This suggests that, in some people, constipation may not be only about slow movement of the gut. It may also be about reduced mucus due to bacterial activity.
This could explain why some people do not respond well to regular laxatives. Laxatives may increase water in the stool, but they do not fix the underlying mucus problem.
Practical Steps to Support Healthy Mucus and Gut Balance
While research is still ongoing, there are practical steps you can take to support gut health and possibly protect your mucus layer.
Eat Enough Fiber
Fiber feeds good bacteria and helps maintain a balanced gut. Include:
- Fruits like apples and pears
- Vegetables like carrots and spinach
- Whole grains like oats and brown rice
- Legumes like lentils and chickpeas
Fiber also increases stool bulk and helps it move smoothly.
Stay Hydrated
Water helps fiber do its job. Without enough water, stools can become dry and hard. Aim to drink fluids regularly throughout the day.
Avoid Overusing Laxatives
Frequent use of stimulant laxatives may irritate the gut. If you rely on them often, speak with a healthcare professional to explore other options.
Include Prebiotic Foods
Prebiotic foods help beneficial bacteria grow. Examples include:
- Garlic
- Onions
- Bananas
- Asparagus
These foods may help maintain a healthier bacterial balance.
Consider Professional Guidance
If you have long-term constipation, especially if it does not improve with diet and lifestyle changes, consult a doctor. In the future, treatments that target specific bacterial enzymes may become available .
A New Way to Think About Constipation
Constipation is not always just about fiber or hydration. In some cases, certain bacteria may reduce the protective mucus layer in the colon. When mucus decreases, stool loses lubrication and water, making it harder to pass.
This research opens the door to new ways of understanding and treating constipation. Instead of focusing only on stool movement, we may also need to look at the health of the mucus layer and the balance of gut bacteria.
Taking care of your gut through proper nutrition, hydration, and healthy lifestyle habits remains the foundation. As science advances, we may soon see more targeted therapies that address the bacterial causes of constipation directly .