For the millions of Americans living with irritable bowel syndrome (IBS), managing symptoms like abdominal pain, gas, and bloating often requires careful attention to diet. According to Dr. Neha Mathur, a gastroenterologist at Houston Methodist, dietary modifications can be an effective way for many patients to control their IBS symptoms.
“In many patients with IBS, dietary modifications is an effective non-pharmaceutical option to help minimize or control their symptoms,” says Dr. Mathur. “There are many foods that are common in our diet that, when consumed and broken down by our gut, can lead to worsening of these symptoms. These are also commonly categorized as foods high in FODMAP.”
FODMAP refers to fermentable oligosaccharides, disaccharides, monosaccharides and polyols—types of carbohydrates that can trigger IBS symptoms in sensitive individuals. While most people digest these without issue, those with IBS may experience increased gas and discomfort due to fermentation by gut bacteria.
“A diet low in FODMAPs has become the standard all physicians agree on for IBS dietary interventions,” says Dr. Mathur. “There is strong evidence that a low-FODMAP diet helps control and reduce symptoms of IBS and can actually improve quality of life for people with certain chronic conditions.”
Dr. Mathur emphasizes that not every person with IBS will react to all high-FODMAP foods: “Not everyone with IBS is sensitive to all foods high in FODMAP, but these are some of the most common foods that can help someone know where to start,” she adds. “Ultimately, each patient will need to have their diet modifications tailored to them.”
The process typically begins with an elimination phase lasting four to six weeks under guidance from a registered dietitian. Common items removed include dairy and gluten products.
After this period, foods are reintroduced one at a time over several days: “After you have successfully avoided foods high in FODMAP, the next step is to reintroduce one food at a time over a three-day period and note if any of your symptoms return.”
If no reaction occurs after reintroduction, the food may remain part of the regular diet; otherwise it is identified as a possible trigger.
Dr. Mathur lists seven types of food or ingredients often linked with symptom flare-ups:
1. Dairy products such as milk from cows or goats and soft cheeses.
2. Gluten-containing grains like wheat, barley and rye.
3. Carbonated beverages including soda and sparkling water.
4. Certain fruits and vegetables such as apples, asparagus, broccoli and legumes.
5. Sweeteners like honey or sorbitol.
6. Red meat which may be harder for some people’s digestive systems.
7. Alliums including garlic and onions.
In addition to avoiding specific triggers through the low-FODMAP approach—which should be done carefully alongside professional advice—other strategies may also help manage IBS:
– Increasing soluble fiber intake through sources like chia seeds or psyllium husk supplements.
– Consuming peppermint for its muscle-relaxing properties.
– Including yogurt in moderation because it contains probiotics which aid digestion.
– Using probiotics containing lactobacillus or bifidobacterium strains could benefit some patients’ gut microbiome balance; however research remains ongoing regarding their effectiveness.
Lifestyle changes such as regular exercise, adequate sleep hygiene and addressing mental health concerns may further support symptom management given the role of brain-gut interactions in IBS.
“If any IBS symptoms are persistent for more than a few months and are either getting worse or not responding to dietary modifications, I always recommend people to seek expert consultation,” says Dr. Mathur.
She advises seeking medical care sooner if severe signs appear—including bloody stool or unintentional weight loss—as these require prompt evaluation by specialists.
