Research suggests up to 30% of people with irritable bowel syndrome (IBS) may have non-celiac gluten sensitivity. These individuals often experience bloating, pain, fatigue, and brain fog after eating gluten.
Many people who live with irritable bowel syndrome, or IBS, struggle with daily stomach problems. These may include bloating, gas, abdominal pain, diarrhea, or constipation. For years, doctors believed these symptoms were mainly due to a sensitive gut. But newer research suggests another possible cause for some people: gluten sensitivity.
In fact, new research suggests that up to 30% of people with IBS may have something called non-celiac gluten sensitivity. This means their bodies react poorly to gluten even though they do not have celiac disease.
Understanding this connection may help many people finally get relief from frustrating IBS symptoms.
What Is IBS?
Irritable bowel syndrome is a common digestive condition. It affects millions of people around the world. IBS does not damage the intestines, but it can cause uncomfortable symptoms that interfere with daily life.
Common IBS symptoms include:
- Bloating
- Stomach pain or cramping
- Gas
- Diarrhea
- Constipation
- Feeling like the bowel does not fully empty
Symptoms often come and go. Many people notice that certain foods, stress, or lack of sleep can make symptoms worse.
What Is Gluten?
Gluten is a protein found in grains such as:
- Wheat
- Barley
- Rye
It is commonly found in foods like bread, pasta, cereal, crackers, and baked goods.
Some people must avoid gluten because they have celiac disease, an autoimmune condition that damages the small intestine. But many others may react to gluten without having celiac disease. This condition is called non-celiac gluten sensitivity, or NCGS.
What Is Non-Celiac Gluten Sensitivity?
Non-celiac gluten sensitivity occurs when someone experiences symptoms after eating gluten but tests negative for celiac disease.
Symptoms can include digestive problems such as:
- Bloating
- Abdominal pain
- Gas
But symptoms can also occur outside the digestive system, including:
- Tiredness
- Headaches
- Brain fog
- Poor concentration
- Anxiety
- Feeling generally unwell
Because these symptoms can overlap with IBS, researchers wanted to know how common gluten sensitivity might be among people with IBS.
What the New Study Found
Researchers recently studied over 5,000 people in a large survey published in the Journal of Clinical Gastroenterology. Out of these participants, 819 people met the criteria for IBS.
The researchers discovered something surprising.
Among people with IBS, about 29% reported symptoms consistent with non-celiac gluten sensitivity. In comparison, only about 9% of people without IBS reported gluten sensitivity.
In other words, people with IBS were much more likely to report problems with gluten.
This suggests that gluten sensitivity may play a role in symptoms for a significant number of IBS patients.
Symptoms Were Often More Severe
People with IBS who also reported gluten sensitivity tended to have more symptoms overall.
Common digestive symptoms included:
- Bloating
- Abdominal pain
- Gas
But these patients were also more likely to report symptoms outside the gut, such as:
- Fatigue
- Headaches
- Brain fog
- Loss of coordination
- Anxiety
- Depression
These symptoms are sometimes called extraintestinal symptoms, meaning they occur outside the digestive system.
People in this group were also more likely to see medical specialists because their symptoms were more severe or difficult to manage.
Many Were Already Avoiding Gluten
Another interesting finding from the study was that many people with IBS and gluten sensitivity were already following a gluten-free diet.
About 61% of those with gluten sensitivity were avoiding gluten, compared with about 40% of IBS patients without gluten sensitivity.
Many people said they started the diet because they noticed symptoms after eating foods containing gluten.
Others started the diet based on medical advice.
This suggests that many IBS patients may already suspect gluten is part of their problem.
Could a Gluten-Free Diet Help IBS?
For some people with IBS, removing gluten from the diet may improve symptoms. But doctors caution that this approach should be done carefully.
Gluten is found in many foods, and removing it completely can make a diet more restrictive. Without proper guidance, people may miss important nutrients.
For this reason, experts suggest that people with IBS who suspect gluten sensitivity should consider a supervised trial of a gluten-free diet.
This usually involves:
- Removing gluten from the diet for several weeks
- Monitoring symptoms carefully
- Reintroducing gluten to see if symptoms return
This process can help determine whether gluten is truly a trigger.
Important: Rule Out Celiac Disease First
Before starting a gluten-free diet, doctors recommend testing for celiac disease.
This is important because once someone removes gluten from their diet, the test for celiac disease may become less accurate.
A healthcare provider can order simple blood tests to check for this condition.
Not Everyone With IBS Needs to Avoid Gluten
While gluten sensitivity may affect up to one in three people with IBS, it does not affect everyone.
Many people with IBS have symptoms triggered by other factors such as:
- Stress
- Certain carbohydrates called FODMAPs
- Fatty foods
- Caffeine
- Large meals
Because IBS triggers can vary from person to person, treatment often requires a personalized approach.
The Bottom Line
Irritable bowel syndrome can be frustrating and difficult to manage. But new research suggests that gluten sensitivity may be contributing to symptoms in up to 30% of people with IBS.
For these individuals, a carefully supervised gluten-free diet may help reduce symptoms such as bloating, abdominal pain, fatigue, and brain fog.
However, gluten is not the problem for everyone with IBS. The best approach is to work with a healthcare provider to identify personal triggers and develop a diet plan that supports long-term digestive health.
Understanding your body’s response to food can be one of the most powerful steps toward feeling better.