What diet changes can help manage my IBS-C symptoms?

Question

Hello doctor,

I am a 29-year-old man recently diagnosed with IBS-C. After months of bloating, excessive gas, and constipation despite drinking plenty of water. My doctor asked me to change my diet, but did not explain what exactly to eat or avoid, which left me very confused.

Should I be eating more fiber, or is too much fiber making my bloating worse?
I have heard that gluten and dairy trigger IBS in some people. Is that true for everyone?
How do I figure out my trigger foods without accidentally making my symptoms worse in the process?

Kindly help.

Answer 1

Hello,

Welcome to icliniq.com.

I understand your concern.

Your symptoms are consistent with irritable bowel syndrome with constipation predominance (IBS-C). Diet plays an important role in symptom control, but the effect varies between individuals, which is why general advice can sometimes feel confusing.

Fiber can help irritable bowel syndrome with constipation predominance (IBS-C), but the type of fiber matters. Soluble fiber (such as Psyllium, oats, or chia seeds) can soften stools and improve bowel movement regularity. However, insoluble fiber (such as wheat bran) may worsen bloating and gas in some people. It is best to increase fiber gradually while maintaining good hydration to allow your gut to adjust.

Regarding gluten and dairy, these are not triggers for everyone with irritable bowel syndrome (IBS). Some people have lactose intolerance, where dairy products cause gas and bloating. Gluten sensitivity can also occur in a small number of patients, though true gluten-related disease is less common unless tests suggest it. Rather than eliminating many foods at once, a structured approach works better.

Many patients benefit from trying a low-FODMAP diet (fermentable oligosaccharides, disaccharides, monosaccharides, and polyols), which temporarily reduces certain fermentable carbohydrates that can cause gas and bloating. After a short elimination phase (usually four to six weeks), foods are gradually reintroduced to identify specific triggers.

Keeping a food and symptom diary can help identify patterns between meals and symptoms. In addition, regular meals, physical activity, and stress management can improve bowel function.

With a gradual and structured dietary approach, most people with irritable bowel syndrome with constipation predominance (IBS-C) can identify triggers and achieve better symptom control without overly restrictive diets.

I hope you are satisfied with my answer. For further queries, you can consult me at iCliniq.

Thank you.