Thirty years of bad food. Fourteen years on multiple medications. If anyone’s gut was beyond saving, it should have been mine.
That’s what I assumed, anyway. Decades of ultra-processed food. Long-term statins, allopurinol, antihistamines, some of them for over twenty years. By the time I changed anything I was in my fifties. And the thing people kept saying, sometimes doctors, sometimes well-meaning people online, was that this kind of damage takes years to undo. If it undoes at all.
Here’s what my actual blood tests showed: CRP down 84% in three months. Calprotectin below 5. ALT at the lowest point in NHS records going back to 2012.
Not years. Three months.
If you’ve been telling yourself the damage is probably done by now, this one’s for you.
The Myth That Keeps People Stuck
The gut damage myth goes something like this. Decades of bad food, long-term medication, chronic stress: that leaves a mark. The gut lining thins. The microbiome loses diversity. Inflammation becomes your baseline rather than an emergency response. And by the time you’re in your fifties, looking back at thirty years of ultra-processed food and wondering if anything can be done, the conventional wisdom says: slowly, maybe, with a lot of work, and probably not completely.
It’s not wrong, exactly. It’s just incomplete in a way that matters.
The reasoning behind it is fair. The gut lining does replace itself, yes, but it replaces itself into the same inflammatory environment if nothing has actually changed. Bacteria wiped out by years of antibiotics don’t come back on their own. Long-term statin use, for some people, does appear to affect gut bacterial composition. And the kind of chronic low-grade inflammation I’m about to show you in the numbers, CRP running at 6.2 for years, does accumulate. It doesn’t simply disappear when you decide to eat better.
Here’s what the myth gets wrong. It assumes the damage is structural and permanent, when the evidence suggests something far more interesting. The gut’s recovery mechanisms are largely intact. They’re just waiting for the conditions to change.
Will Bulsiewicz, gut doctor, one of the world’s leading gastroenterologists, and someone whose work I kept coming back to during this, put it in a way that reframed everything for me. He said the most anti-inflammatory compounds he’s encountered in twenty-five years of medicine are short-chain fatty acids: produced by gut bacteria when they ferment dietary fibre. Not a supplement. Not a drug. A biological process that your own bacteria run, when you give them the right inputs.
The question isn’t whether the gut can produce those compounds. It’s whether the bacteria that produce them are still there. And what I found, in actual blood tests, is that the answer is more hopeful than I expected.
What My Data Looked Like Before
Let me show you what thirty years of bad inputs actually looked like in the data. These are specific numbers, with dates.
December 2023. ALT (alanine aminotransferase, the liver enzyme): 69 iu/L. The upper reference limit is 40. I was at 173% of the upper limit. I’d been on statins for eleven years at that point. ALT is a downstream marker for gut-driven inflammation, because the gut and the liver are in constant conversation via the portal vein. When the gut is inflamed and the barrier is compromised, the liver sees it first. Mine was clearly seeing something.
January 2025. CRP (C-reactive protein, the systemic inflammation marker): 6.2 mg/L. Technically within the NHS reference range, which goes up to 10. But mid-range is not the same as low. Tim Spector at King’s College London noted in research he cited that people eating fermented foods daily saw significant drops in nineteen inflammatory proteins in a matter of weeks. The implication: CRP at 6.2 is not a neutral reading. It’s an elevated inflammatory load running quietly in the background.
Now here’s the thing that matters for the myth. These weren’t readings from someone who wasn’t paying attention. I was on medication. I was seeing my GP. I was doing what the system told me to do. The ALT at 69 had been creeping upward since 2012, when it was 37. By 2016 it was 39. By 2023 it was 69. Eleven years of medication doing nothing to the underlying inflammatory load, and in the case of the liver enzyme, possibly contributing to it.
Think of chronic low-grade inflammation like a cold so mild you never quite notice it. No obvious fever. No sick day. Just a faint, persistent hum of not-quite-right that you’ve had so long you’ve forgotten what normal feels like. That’s what 6.2 CRP running for years actually feels like from the inside. And it’s what was happening in my gut and liver in the background, while I was on six medications and doing everything the system told me to do.
The gut symptoms I had weren’t dramatic either. No diagnosis. No IBD. Just bloating I’d normalised. Digestion that felt sluggish but not broken. And those ALT numbers that kept creeping up on the annual blood test, which the GP noted and monitored, but never connected to anything the medication could fix. Because it wasn’t something the medication could fix. It was upstream of everything the medication was managing.
What I Actually Changed
Boxing Day 2023. That’s when everything changed.
Stopped ultra-processed food. Started 18:6 time-restricted eating. Introduced fermented foods, kefir, sauerkraut, kimchi, daily. February 2024 the medications came off. All six. Recorded in NHS bloods throughout. We agreed a trial: monthly blood tests for the first three months, then quarterly, with the understanding that if anything moved in the wrong direction we’d revisit.
My GP’s position was cautious but not obstructive. She wanted to see data before drawing any conclusions. That was exactly right, and it’s what made the next three months genuinely interesting.
The intervention itself wasn’t complicated. It was not a supplement programme. It wasn’t a gut cleanse. It was: remove the inputs that were driving the inflammation, add the inputs that feed the bacteria responsible for producing anti-inflammatory compounds, and give the gut the overnight window it needs to do its own repair work. That’s it. The complexity is in why it works. The intervention itself was fairly straightforward.
What I didn’t do was expect rapid results. The conventional wisdom said this takes years. I wasn’t expecting three months to do much.
What the Numbers Showed After Three Months
April 2025. Fourteen months after the intervention started.
CRP: 1.0 mg/L. Down from 6.2 in January 2025. That’s an 84% reduction in three months.
ALT: 23 iu/L. Down from 69 in December 2023. The lowest ALT reading in my entire NHS dataset. Down 67% from the peak. The trajectory: 69 in December 2023, dropped to 28 in March 2024 (one month after stopping statins), and continued falling to 23 by April 2025. The liver, given the right conditions, recovered faster than I expected.
Calprotectin: below 5. That’s the gut inflammation marker specifically, measuring inflammatory proteins in the gut lining directly. Below 5 is considered optimal gut health. Not managed. Optimal.
Then the eight-marker picture. Because here’s what made my GP pause when she looked at the April 2025 results. It wasn’t just CRP. Eight different biomarkers improved simultaneously: HbA1c down 19.6%, CRP down 84%, ALT down 67%, HDL up 15%, LDL down 32%, cholesterol-to-HDL ratio down 23%, bilirubin down 25%, creatinine down 13%. All moving in the right direction. All at the same time. With no improvements across any of those markers during the twelve years I was on medication.
She looked at the results and said: “Are you back on statins?” I wasn’t. She paused. Looked at the file. Looked at the screen. “Whatever you’re doing, keep doing it.”
That’s not a dramatic story. That’s a GP looking at numbers she wasn’t expecting. But it matters for the myth. Because what those numbers suggest, and it’s a working hypothesis, N=1, one person, data going back to 2012, is that eight biomarkers moving simultaneously in the same direction after the same intervention is not coincidence. It’s a system responding to a root cause being addressed.
Why the Biology Is More Forgiving Than We’re Told
People ask me all the time: how do I get rid of the bad bacteria in my gut? And the answer is, you don’t, really. You outcompete them.
Think of your gut like a garden. If you plant enough of the right things and tend to them properly, there’s no room left for the weeds. They don’t disappear because you attacked them. They disappear because they’ve been crowded out. You don’t need a chemical. You need ground cover. Feed the good stuff well enough and the bad stuff runs out of space.
That process starts the moment you change the inputs. And the biology doesn’t care how old you are when you start.
The gut lining replaces itself constantly. Microbiome composition can shift meaningfully within days of a dietary change, and the research on this is fairly consistent. And the bacteria responsible for producing the short-chain fatty acids that reduce inflammation, the ones Bulsiewicz was talking about, respond to fibre. Specifically, dietary fibre from diverse plant sources. Not supplements. Food.
What my data seems to show is that after thirty years of not providing those inputs, the bacteria were still there. Dormant, depleted, outcompeted by less beneficial strains, but not gone. Give them the right environment and they came back. Quickly. The 84% CRP drop in three months is hard to explain any other way.
I’m not claiming this would look the same for everyone. N=1. My body, my blood tests, my GP. But eight markers moving in the same direction after the same root-cause intervention, that’s not random noise.
The Version of This I Wish Someone Had Told Me at 35
Here’s the part of the myth that I think does the most damage. Not the “it takes years” version. The earlier one. The version that says: I haven’t been diagnosed with anything yet, so I probably don’t need to worry.
If you’re noticing things, bloating that doesn’t fully resolve, energy that’s consistently flat after eating, inflammation markers that sit in the middle of the normal range while your GP says “let’s keep an eye on it”, that’s the moment to act. Not after the diagnosis arrives.
My ALT was 37 in 2012. Mid-range. Nothing alarming. Twelve years later it was 69, I was on six medications, and the underlying inflammatory load had been running in the background the whole time. The markers were telling me something for a decade before anything became urgent.
That pattern, slow accumulation below the threshold of diagnosis, is what makes the “I haven’t got a diagnosis so I’m probably fine” version of this myth the most expensive one to believe.
The biology doesn’t wait for the diagnosis to start. And from what my data suggests, it doesn’t wait for decades of recovery either, once you change the inputs.
I’ll leave that with you.
Key Takeaways
- The gut is more plastic than the conventional wisdom suggests: Three months of targeted dietary change moved eight biomarkers simultaneously, after twelve years of medication had moved none.
- Mid-range is not the same as low: CRP at 6.2 mg/L is technically within the NHS range. It’s also 84% higher than where it ended up after three months of different inputs.
- The mechanism is simpler than the myth: Remove the inputs driving inflammation, add the inputs that feed anti-inflammatory gut bacteria, give the gut the overnight window it needs to repair.
- The early signal matters: ALT was 37 in 2012. Twelve years of slow accumulation before it hit 69. The time to act is when the numbers are in the middle, not when they’ve crossed a clinical threshold.
- This is N=1 data: One person, NHS blood tests going back to 2012, Recorded in NHS bloods throughout. Not a clinical trial. But eight biomarkers moving in the same direction after the same intervention is worth taking seriously.
Want to Start Resetting Your Own Rhythm?
If this post has made you think about your own inflammation markers and what might actually be driving them, the 14-Day Rhythm Reset Guide is the place to start. It covers eating windows, what to eat, how to structure your days, and it’s free.
The guide won’t fix three decades of bad inputs in a fortnight. But it gives you a framework for changing the inputs. And from what my data suggests, that’s where the biology begins to respond.
👉 Get the 14-Day Rhythm Reset Guide (free)
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⚠️ Important: This is educational content based on evidence and personal experience. It is not medical advice. Speak to your GP before making changes to your fasting pattern, diet, or medication.
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