What Is a Leaky Gut and Can It Be Healed?

"Leaky gut” is one of those terms that sounds a bit alarming and a little abstract. You might have come across it on social media, heard it from a friend, or even had a practitioner mention it. But what does it actually mean? And more importantly: is there anything you can do about it? The good news is yes—the gut lining is remarkably resilient. With the right support, it can heal. Let’s break it down in plain language.

First, what exactly is the gut lining?

Your digestive tract is lined with a single layer of cells making it remarkably thin, but incredibly important. Think of it as a very smart bouncer: it decides what gets into your bloodstream and what doesn’t. Nutrients get waved through; undigested food particles, bacteria, and toxins are meant to stay out. The cells of this lining are held together by structures called tight junctions which are essentially the “mortar” between the bricks. When those junctions are working well, the lining is selective and protective. When they start to break down, the gaps widen.

So what is “leaky gut”?

“Leaky gut”, or intestinal permeability, in clinical language, is when those tight junctions loosen, allowing things to pass through that shouldn’t. This doesn’t mean your gut is literally full of holes. It means the selective filter has become less selective.

When this happens, the immune system, which lives largely in and around the gut, can start reacting to substances that slip through. This can trigger a low-grade, chronic inflammatory response that shows up in all sorts of ways:

• Bloating, gas, or unpredictable digestion

• Food sensitivities that seem to be multiplying

• Skin issues like eczema, acne, or rashes

• Brain fog or low energy

• Joint aches

• Mood fluctuations or anxiety

• Autoimmune flares

Not all of these are caused by a leaky gut, but all of them can be worsened by it. That’s why it’s worth paying attention to.

What causes the lining to become more permeable?

There’s rarely a single culprit, it’s usually a combination of factors that have added up over time:

• A diet high in ultra-processed foods, refined sugars, and industrial seed oils

• Chronic stress (your gut and nervous system are in constant conversation)

• Overuse of certain medications, including NSAIDs and antibiotics

• Alcohol, especially in excess

• Infections, gut dysbiosis, or an imbalanced microbiome

• Lack of sleep and chronic exhaustion

Sound familiar? These are many of the same factors that affect overall health. The gut doesn’t exist in isolation, it reflects everything else going on in your life.

Can it actually heal?

Yes, and this is the part I love sharing with clients. The gut lining renews itself every 3–5 days. That’s an extraordinary capacity for regeneration. Which means that when you give it what it needs and reduce what’s damaging it, things can shift more quickly than you might expect. That said, healing isn’t about a dramatic 30-day protocol or eliminating everything you love. It’s about consistent, small changes that your body can actually sustain.

Where to start: gently

Here are the shifts that tend to make the biggest difference, without requiring you to overhaul your entire life overnight:

1. Feed your gut bacteria. Diversity is the goal. Aim for 30 different plant foods per week including vegetables, fruits, herbs and spices. Each one feeds different strains of gut bacteria, which in turn help maintain the lining. You don’t have to count obsessively; just think “a little bit of lots of things.”

2. Include fermented foods. Yogurt, kefir, sauerkraut, kimchi, miso, kombucha introduce beneficial bacteria and have been shown to increase microbiome diversity. Start small if your gut is sensitive; even a tablespoon of sauerkraut with a meal is a great beginning.

3. Prioritise gut-nourishing foods. Bone broth contains collagen and amino acids (especially glutamine) that directly support the gut lining. Oily fish brings anti-inflammatory omega-3s. Colourful vegetables provide the polyphenols that gut bacteria thrive on. Olive oil has gentle anti-inflammatory properties.

4. Ease up on the gut irritants without going to extremes. You don’t need to give up everything. But reducing ultra-processed foods, alcohol, and excess sugar, even just some of the time, gives your gut a chance to recover. The goal is progress, not perfection.

5. Look after your stress. This one is often underestimated. Chronic stress increases intestinal permeability directly via your nervous system and stress hormones. It doesn’t have to be meditation (though that helps). A walk outside, a slow meal without screens, a good night’s sleep all count.

6. Don’t skip sleep. Your gut repairs itself at night and so does pretty much everything else. Seven to eight hours is where the magic happens. If sleep is a struggle, it’s worth addressing directly, not just powering through.

A note on testing

If you suspect leaky gut is playing a role in your symptoms, functional testing can be useful—including markers of intestinal permeability, inflammatory markers, and gut microbiome analysis. But testing is just information. The real work happens in the daily choices, not the lab report.

The bottom line

A leaky gut isn’t a life sentence. It’s a signal—your body’s way of telling you it needs a little more support. And the beautiful thing is that the steps that help heal it are the same steps that make you feel better overall: more real food, more variety, less stress, more rest.

You don’t have to do it all at once. Pick one thing this week. See how it feels. That’s how sustainable change actually works.

And if you are curious whether gut health might be at the root of what you’re experiencing, know that I work with clients to untangle exactly this kind of thing—step by step, at a pace that feels doable. Get in touch to find out how we might work together.