Gut health education
Leaky Gut Diet: Foods to Limit, Foods to Emphasize
When the gut lining becomes more permeable than it should be, the immune system starts reacting to foods that never used to bother you, and symptoms spread far beyond the digestive tract. This page explains which foods aggravate intestinal permeability, which foods support repair, and how functional testing turns a general list into your own plan.
Why food matters in intestinal permeability
The gut lining is a single cell layer thick, held together by tight junctions that decide what gets absorbed. When those junctions loosen, the immune system meets food particles it was never meant to see, and it answers with inflammation. Every meal then becomes either part of the problem or part of the repair.
Two levers matter most: removing the specific foods your immune system is currently reacting to, and adding the foods and nutrients the lining uses to rebuild. Guessing wrong on the first lever is why so many self-directed gut diets stall.
Foods most often worth limiting
| Food | Why it comes up |
|---|---|
| Gluten and wheat | Gliadin is the best-documented dietary trigger of zonulin release, the signal that opens tight junctions. It is the first removal in almost every permeability program. |
| Dairy | Casein is a top IgG reactor. While the barrier is open, partially digested casein fragments cross easily and keep the immune system activated. |
| Refined sugar | Sugar feeds inflammatory gut bacteria and yeast, and high-glycemic eating raises the inflammatory signals that loosen tight junctions. |
| Alcohol | Alcohol directly irritates the gut lining and measurably increases permeability, even in moderate amounts, while the lining is trying to repair. |
This is a starting list, not a life sentence. An IgG food panel and stool analysis show which categories actually matter for you right now, and most foods return after the repair phase.
Foods to emphasize
- Bone broth and slow-cooked meats, for glycine and glutamine building blocks
- Cooked non-starchy vegetables, gentle on digestion while the lining repairs
- Wild-caught fish, for omega-3s that cool gut inflammation
- Fermented vegetables in small amounts, to reseed beneficial bacteria
How testing turns a general list into your plan
Symptoms alone cannot tell you whether the driver is food reactivity, a bacterial imbalance, yeast overgrowth, low stomach acid or lingering permeability itself. A stool analysis maps the microbiome, digestion and gut inflammation, while an IgG food panel shows exactly which proteins your immune system is flagging.
From those results we build a written nutrition and supplement plan specific to you, usually structured as a remove, repair, reintroduce sequence over about 90 days, then retest. This is educational and assessment focused care to support your gut's own repair process, not a diagnosis or treatment, and it works alongside the care of your prescribing provider.
Common questions
What is leaky gut?
Leaky gut, or increased intestinal permeability, means the tight junctions between the cells lining your small intestine have loosened. Larger food particles and bacterial fragments can then cross into circulation, where the immune system flags them and produces inflammation.
What are common signs of intestinal permeability?
Bloating, new food sensitivities that keep multiplying, skin flares, joint aches, brain fog and fatigue are the classic cluster. Because the symptoms are so broad, permeability is best confirmed with testing rather than guessed from symptoms alone.
Can food heal a leaky gut?
Food is the foundation. Removing the specific foods your immune system is reacting to lowers the inflammatory pressure on the gut lining, while repair-focused foods and targeted nutrients support the tight junctions as they rebuild. Most structured programs run about 90 days before retesting.
Is a leaky gut diet the same as a food sensitivity diet?
They overlap heavily. The IgG food panel identifies which foods are crossing the barrier and triggering immune reactions, and those are the foods removed first. The difference is that a permeability program also adds lining-supportive foods and nutrients rather than only removing triggers.
How is leaky gut assessed?
We use an IgG food sensitivity panel, a stool analysis that looks at digestion, inflammation and the microbiome, and sometimes a direct permeability marker such as zonulin. Together these show how much permeability is present and what is driving it.
Will I have to avoid these foods forever?
Usually not. Once the lining has repaired and inflammatory markers settle, most foods are reintroduced one at a time in a structured way. A small number of strong reactors may need longer breaks, but the goal is always the widest diet you can comfortably tolerate.