How to Repair a
    Leaky Gut

    Your gut lining could be the missing piece behind symptoms that never quite add up.

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    Intestinal Permeability

    If you’ve been told you have a “leaky gut“, or you’ve come across the term while trying to work out why you feel so unwell, you’re probably looking for a straightforward answer: what does it actually mean, and how do you repair a leaky gut in a way that actually works for your life, rather than a generic plan that ignores your real circumstances?

    We’ll explore what intestinal permeability is, why it develops, and the kind of root-cause, personalised approach that can support your gut long-term. As a nutritional therapist working in functional medicine, I look at your gut, your immune system, and your everyday life together, because in my experience, they rarely tell separate stories.

    What Leaky Gut Really Means

    In simple terms, your gut lining is a single layer of cells that acts like a security gate. It lets nutrients through into your bloodstream and keeps out the things that shouldn’t get through: undigested food particles, toxins, and bacteria. When that lining becomes more permeable than it should be, often called “leaky gut” or intestinal permeability, more of those unwanted particles can slip through the gate. Your immune system, which sits largely around your gut, notices this and reacts. That reaction is where a lot of the wider, seemingly unrelated symptoms come from, which is why gut health and immune health are so closely tied together in functional medicine.

    Why People Look to Find Out How To Repair a Leaky Gut

    Most people don’t come across this term by accident. They come to it after months, sometimes years, of bloating, fatigue, skin flare-ups, food reactions, joint aches, or brain fog that doctors haven’t been able to explain, or have put down to stress. If that sounds familiar, you are not imagining it, and you are not alone. A lot of people I work with have been told their bloodwork is “normal” while they still feel far from well, and that gap between how you feel and what the standard tests show is often exactly where gut health comes in. Taking those symptoms seriously, rather than dismissing them, is usually the first real step towards understanding what’s actually going on.

    Is Leaky Gut a Serious Condition?

    It’s a fair question, and one I’m asked often. Intestinal permeability is a genuine, studied physiological process, though the term “leaky gut” itself is more commonly used in nutritional therapy and functional medicine than in conventional practice. That doesn’t make the underlying experience any less real. What it means in practice is that your gut and your wider health are more connected than a lot of standard care accounts for, and looking at gut function is a reasonable, evidence-informed place to start when symptoms don’t add up.

    Possible Causes

    There isn’t usually one single cause. A few of the most common contributors I see are a diet low in variety, particularly one lacking in fibre and plant diversity; ongoing stress (chronic stress genuinely affects gut lining integrity); certain medications such as long-term NSAID use; alcohol; past infections; and an imbalanced gut microbiome, the community of bacteria living in your digestive tract.

    Often it’s a combination of a few of these building up quietly over time rather than one obvious trigger, which is exactly why generic advice rarely gets to the bottom of it, and why two people with similar symptoms can need quite different plans.

    A Root Cause Approach

    There is no single supplement or seven-day plan that will repair a leaky gut on its own, and I would be doing you a disservice if I told you otherwise. What actually helps is working out which of the contributors above apply to you and building a personalised plan around that.

    This might involve looking at your current diet, your stress levels, your sleep, and, in some cases, functional testing to get a clearer picture of what’s happening in your gut. From there, we build a realistic, step-by-step plan to support your gut lining and calm the immune response that’s been keeping you unwell.

    It’s not instant, and I won’t pretend otherwise. Most people notice gradual change over weeks and months, not days, because you’re supporting a real process, not masking symptoms with something that wears off.

    Practical Steps

    While a personalised plan will always work better than generic advice, some general principles tend to support efforts to repair a leaky gut for most people.

    Increasing the variety of plants in your diet, not just the amount, feeds a wider range of beneficial bacteria in your microbiome. Reducing ultra-processed food, where it’s realistic to do so, takes some of the burden off your gut. Managing stress, even in small, consistent ways, matters more than most people expect, given how closely stress and gut function are linked. Introducing fermented foods gradually, rather than all at once, also tends to sit better with a gut that’s already under strain.

    None of this replaces working out your individual root cause, but it’s a sensible, low-risk place to start while you consider more personalised support.

    Working with Someone who Takes Your Symptoms Seriously

    I’m Timea Kiss, a Registered Nutritional Therapist trained at the College of Naturopathic Medicine in London, and registered with BANT and CNHC. I am also Bsc(Hons) trained in Naturopathic Nutritional Therapy through the Institute for Optimum Nutrition (ION), validated by the University of Portsmouth.

    I am working in root-cause, functional medicine, with a particular focus on immune health, gut health, and hormonal wellbeing. I know what it’s like to be told there’s nothing more that can be done, because I’ve been there myself, and it’s part of why I do this work now. I see people of all ages and genders, not just one type of client, because everyone deserves to have their symptoms taken seriously.

    If you’re ready to understand what’s going on and want a personalised, honest way forward, I offer a free call to talk through your situation, with no pressure attached. There’s no obligation, just an honest conversation about whether working together is the right next step to repair a leaky gut for good.

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