Have you been told you have leaky gut or multiple food sensitivities?

Picture the list on the refrigerator. It started with gluten, then dairy came off, then eggs, then a few vegetables that seemed to make your stomach swell or your skin flare. Each new elimination brought a few good weeks before something else started causing trouble, and now every meal feels like a negotiation. When the list keeps growing like that, the problem usually sits deeper than any single food. A gut lining that has become too permeable will react to almost anything that passes through it, and the list keeps getting longer because the lining itself has not been repaired.

Leaky gut is the everyday name for increased intestinal permeability, which means the lining of your small intestine has become more porous than it should be. That lining is a single layer of cells held together by tight junctions, the protein seals between neighboring cells that decide what gets into your bloodstream. When those seals loosen, partially digested food proteins, bacterial fragments, and toxins slip through, and your immune system responds to them as invaders. Food sensitivities, bloating, fatigue, joint aches, skin flares, and brain fog can all grow out of that constant immune response.

Why food sensitivities multiply

Most of your immune system lives right behind the gut wall, because that is where the outside world meets the inside of your body most directly. When the barrier is intact, food is broken down fully and absorbed in small, familiar pieces. When the barrier is loose, larger fragments of the foods you eat most often reach immune cells that were never meant to see them, and your body starts making antibodies against them. This is why people with leaky gut often react most to the foods they eat every day, and why cutting out one food tends to make room for the next one to become a problem.

Food sensitivity testing in this situation often comes back with a long list. That result is useful as a picture of how permeable the gut has become, and the bigger goal is to repair the barrier so the immune system can settle down and many of those foods can come back to the table.

What loosens the gut lining

Several common drivers wear on the tight junctions over time. Chronic stress pulls blood flow away from the gut and slows repair. Gut infections and overgrowth, including SIBO, yeast, parasites, and H. pylori, irritate the lining directly. Regular use of pain relievers like ibuprofen and naproxen, alcohol, and repeated rounds of antibiotics all thin the protective mucus layer that sits over the cells. Gluten prompts the release of zonulin, a protein that opens tight junctions, and in sensitive people that opening lasts longer than it should. Mold toxins and other environmental exposures, low stomach acid, short sleep, and diets low in fiber and high in sugar and processed oils add to the load.

The intestinal lining is also one of the fastest-renewing tissues in the body, replacing itself every few days, which means that once the irritants come down and the right building blocks go in, the gut wall can rebuild fairly quickly.

Reading the leaky gut signal with precision

A yes to having been told you have leaky gut or multiple food sensitivities points to a gut barrier under strain and an immune system that has been on alert for a while. It carries more weight alongside nearby signals: frequent bloating, gas, or fullness, heartburn, stools that are loose, hard, or foul-smelling, new sensitivities to chemicals or fragrances, and symptoms that spread across the skin, joints, mood, and energy. When those show up together, the barrier problem is usually tied to a driver that is still active, such as an infection, an overgrowth, mold exposure, or ongoing stress, and repair goes best when that driver is addressed at the same time.

Practical next steps

Take the biggest irritants out for at least six weeks: gluten, alcohol, routine ibuprofen or naproxen, and the foods that clearly bother you right now. Build meals around cooked vegetables, quality proteins, bone broth, and fruits you tolerate, eat seated and slowly, and protect seven to nine hours of sleep so the gut has the blood flow and downtime it uses to rebuild.

Rebuild the lining with targeted supplements: L-glutamine (an amino acid the intestinal cells use as fuel) at about 5 grams once or twice a day, zinc carnosine, collagen or bone broth protein, and soothing herbs such as slippery elm and marshmallow root, then add a quality probiotic once the main irritants are out.

Find the driver with labs: a comprehensive stool analysis that checks for parasites, yeast, H. pylori, and inflammation markers, a zonulin test, a SIBO breath test when bloating shows up soon after meals, and a urine mycotoxin test if your health declined after time in a water-damaged building.

The rQ Perspective

Leaky gut is one node in a whole-body digestion, immune, and detox network. The useful signal is how the gut barrier, infections and overgrowth, toxin exposure, stress, and food reactions interact. When you can see those drivers clearly, a growing list of forbidden foods turns into a plan that repairs the lining and brings those foods back to your plate.

The rQ assessment is the most comprehensive functional medicine assessment on the market. It gives a clinical-grade look at your genes, detox pathway function, and drivers of illness such as pathogens, and it helps you understand your body. Take the rQ assessment at www.rq.one.

Chase answers, not symptoms.