Gut & digestive education
IBS Diet: Foods to Limit, Foods to Emphasize
Irritable bowel syndrome affects 10 to 15 percent of adults worldwide and is twice as common in women. It is not a disease of the bowel alone, it is a problem at the gut-immune interface. Food sensitivities, bacterial overgrowth and microbiome disruption explain most cases. This page explains which foods most often matter, what to eat more of, and how testing turns a general list into your own plan.
Why food sits at the center of IBS
The lining of the gut houses most of the immune system. When that lining becomes irritated or permeable, partially digested food proteins meet immune cells that were never supposed to see them. The result is low-grade inflammation, mast cell activation and visceral hypersensitivity: the gut becomes jumpy, and normal amounts of gas or distension feel painful.
Dysbiosis adds another layer. When the microbial balance shifts, certain carbohydrates ferment too early and too aggressively, producing bloating, gas and unpredictable bowel movements. The right food changes calm both the immune reaction and the fermentation load, which is why they often outperform symptom-managing medications alone.
Foods most often worth limiting
| Food | Why it comes up |
|---|---|
| Gluten and wheat | A frequent IgG reactor that increases zonulin and intestinal permeability, worsening gut-immune activation in many IBS clients. |
| Dairy | Casein and lactose are common triggers. Dairy can drive mucosal immune reactions and is poorly tolerated when brush-border enzymes are damaged. |
| Yeast | Often overrepresented in SIBO and dysbiosis; yeast-containing foods can aggravate bloating and fermentation-related symptoms. |
| Eggs | A common IgG reactive food that can sustain low-grade gut inflammation even when they seem like a safe protein choice. |
This is a starting list, not a verdict. Removing several food groups at once is hard to sustain and rarely necessary. Testing narrows it down to the foods your immune system is actually reacting to right now.
Foods to emphasize
- Bone broth, for glycine and collagen that support gut lining repair
- Cooked vegetables, which are easier to digest than raw for sensitive guts
- Wild caught fish, for anti-inflammatory omega 3s
- Peppermint oil, as a smooth muscle antispasmodic
How testing turns a general list into your plan
Rather than removing every food on the list at once, we use your own lab results to decide where to start. An IgG food sensitivity panel shows which foods your immune system is currently reacting to. A SIBO breath test, comprehensive stool analysis, calprotectin and zonulin show whether the picture is bacterial, inflammatory or permeability driven.
From those results we build a written nutrition and supplement plan specific to you, then recheck around 90 days to see what actually changed. This is educational and assessment focused care to support your body, not a diagnosis or a treatment for IBS, and it works alongside the care of your prescribing provider.
Common questions
Is IBS caused by food?
Food is often the trigger, not the root cause. IBS usually reflects an underlying gut-immune imbalance: IgG food reactions, SIBO, microbiome disruption, or increased intestinal permeability. Removing reactive foods reduces symptoms while we address the why.
What is the difference between IBS and food sensitivities?
IBS is a symptom label. Food sensitivities are one of the most common drivers behind those symptoms. An IgG food panel shows which foods your immune system is currently reacting to, so you can remove the right ones instead of guessing.
Do I have to follow a low-FODMAP diet forever?
No. A low-FODMAP diet is a short-term elimination and rechallenge tool. The goal is to identify your personal thresholds, heal the gut lining, and eventually expand your diet again. Long-term restriction can reduce microbiome diversity.
Why does my doctor say my tests are normal but I still have symptoms?
Standard screening may miss SIBO, IgG reactions, calprotectin, zonulin and comprehensive stool markers. These tests explain why you feel bloated, urgent or uncomfortable even when basic blood work looks fine.
How long does it take to see improvement?
Bloating and pain often improve within two to four weeks once reactive foods are removed. Bowel regularity and gut repair take longer. We recheck IgG panels and relevant gut markers around 90 days.
Should I take probiotics for IBS?
Probiotics can help, but strain and timing matter. Some strains reduce bloating, while others can worsen symptoms in SIBO. We match the probiotic to your stool or breath test results rather than recommending a generic product.