Starch-Free Diet and the Ebringer Hypothesis

Starch-Free Diet and the Ebringer Hypothesis — scientific infographic poster

Table of Contents

  1. About Alan Ebringer
  2. The Molecular Mimicry Hypothesis
  3. Why Starch?
  4. The London Ankylosing Spondylitis Diet — Basics
  5. What's the Evidence?
  6. Modern Gut-Microbiome Research
  7. How People Test the Diet on Themselves
  8. Low-Starch vs Keto vs AIP vs Mediterranean
  9. Foods the Diet Cuts
  10. Foods Allowed Generously
  11. A Practical Sample Day
  12. Supplements Often Paired
  13. Signs It's Working
  14. Limits and Risks
  15. What Researchers Are Watching
  16. Key Research Papers
  17. Connections
  18. Featured Videos

If you have ankylosing spondylitis (AS), you have probably run into the "low-starch diet" on a forum or a podcast, sometimes alongside Henry Scammell’s 1998 book The New Arthritis Breakthrough, which is about the antibiotic treatment of inflammatory arthritis championed by the late rheumatologist Thomas McPherson Brown. Somewhere in that thread there is usually a reference to an Alan Ebringer and Klebsiella pneumoniae. This page is an honest look at that hypothesis — what it claims, what the evidence actually says, and how to give it a fair trial without wrecking your nutrition or replacing real medical care.

About Alan Ebringer

Alan Ebringer (born in Paris in 1936 and raised in Australia) trained as a rheumatologist and immunologist and spent most of his career at King's College London, where he ran a rheumatology clinic and immunology research group for roughly four decades. He was a clinician first and a theorist second: his patients were real ankylosing spondylitis sufferers being seen at the Middlesex Hospital and later King's, and the "London ankylosing spondylitis Diet" grew out of what he watched work in that clinic.

Ebringer published steadily from the late 1970s through the 2010s on a single big idea: that many chronic autoimmune diseases are triggered and sustained by specific gut or urinary bacteria whose surface proteins look enough like human self-tissue to fool the immune system. For ankylosing spondylitis, the suspect bacterium was Klebsiella pneumoniae. For rheumatoid arthritis, it was Proteus mirabilis. For multiple sclerosis, Acinetobacter. He argued, with steady consistency, that reducing the bacterial load by dietary means could reduce disease activity.

Mainstream rheumatology never fully embraced him, but it also never cleanly refuted him. He was taken seriously enough to publish in peer-reviewed journals for forty years, and many of his clinic patients — some of whom are still posting on ankylosing spondylitis forums today — credit his diet with keeping them functional for decades.

The Molecular Mimicry Hypothesis

The core idea is simple, and the biology behind it is real. Molecular mimicry is the phenomenon in which a short amino-acid sequence on a microbe happens to resemble a short sequence on a human protein closely enough that antibodies (or T-cell receptors) raised against the microbe also bind the human protein. When that happens in the wrong tissue, you get autoimmune damage.

Two key resemblances have been reported:

The proposed chain of events: human leukocyte antigen-B27-positive person has chronic low-grade Klebsiella overgrowth in the gut, their immune system makes antibodies against Klebsiella, those antibodies (and cross-reactive T cells) then bind human leukocyte antigen-B27-bearing cells and collagen-rich tissue in the spine and sacroiliac joints, and the resulting friendly fire is what shows up on magnetic resonance imaging (MRI) as sacroiliitis. Ebringer's cohort studies repeatedly measured elevated serum immunoglobulin A (IgA) anti-Klebsiella antibodies in active ankylosing spondylitis patients compared with healthy human leukocyte antigen-B27 controls, and he argued this was the fingerprint of the process.

Is mimicry alone sufficient to cause disease? Probably not — plenty of people carry cross-reactive antibodies without getting sick. But mimicry combined with human leukocyte antigen-B27's unusual biology (see human leukocyte antigen-B27 Explained), increased gut permeability, and a genetically primed IL-23/IL-17 axis is a plausible multi-hit explanation for why ankylosing spondylitis happens.

Why Starch?

Klebsiella pneumoniae is a facultative anaerobe that ferments a wide range of sugars, but it is particularly efficient at fermenting complex starches in the colon. In laboratory culture, Klebsiella grows faster on starch-rich media than many competing gut organisms. Ebringer's working hypothesis was that a high dietary starch intake feeds Klebsiella preferentially, inflating its population relative to other gut bacteria, which in turn keeps the immune system chronically primed against it.

The logic of the diet, then: if you starve Klebsiella of its preferred substrate, the population drops, the anti-Klebsiella antibody titre drops, the cross-reactive attack on your spine eases off, and symptoms improve. Ebringer’s group reported in 1996 that the low-starch diet lowered total serum immunoglobulin A (IgA) in both healthy volunteers and patients and decreased inflammation and symptoms in the patients; the authors concluded that the diet “requires further evaluation.”

Critics rightly point out that "starch feeds Klebsiella" is an oversimplification. Most dietary starch is digested in the small intestine and never reaches the colon intact; only resistant starch (found in cooled potato, unripe banana, legumes, whole grains) actually reaches Klebsiella's habitat. Ebringer's diet is still built around cutting total starch, not just resistant starch, so the mechanism may be partly wrong even if the clinical effect is real.

The London Ankylosing Spondylitis Diet — Basics

In its simplest form the diet is:

There is no calorie counting, no macro-tracking, and no fasting requirement. The rule of thumb is: if it tests positive with iodine (the classic starch stain), cut it. Sugar, honey, and most fruit are allowed because simple sugars are absorbed in the small intestine and do not reach the colon to feed Klebsiella.

That last point surprises many patients: Ebringer's diet is not low-carb in the ketogenic sense. You can eat apples, grapes, berries, and even a modest amount of table sugar. What you cut is specifically complex starch.

What's the Evidence?

This is where honesty matters. The evidence for the London ankylosing spondylitis Diet is suggestive but not conclusive.

What we have:

What we don't have:

The fair summary: Ebringer's hypothesis is plausible and intriguing, but not proven. It sits in the "some patients try it alongside real treatment, not instead of it" tier — roughly where Mediterranean-diet recommendations sat 25 years ago before the evidence caught up.

Modern Gut-Microbiome Research

A striking twist: twenty-first-century microbiome research, done with 16S ribosomal RNA sequencing rather than Ebringer's old antibody assays, has independently confirmed that ankylosing spondylitis patients have a distinctive gut microbiome. Findings that line up (at least loosely) with Ebringer's picture:

None of this proves the Ebringer story. But it does mean the fundamental idea — that ankylosing spondylitis is a gut-joint axis disease — has aged better than anyone expected in 1980.

How People Test the Diet on Themselves

People who test the diet on themselves often run it like a clinical trial of one:

  1. A start date and a 6–8-week window. The reasoning people give: shorter trials leave gut flora too little time to shift, and trials much longer than 8 weeks make it hard to tell diet from seasonal change.
  2. A baseline record. The current BASDAI score (it can be self-scored online), how long morning stiffness lasts, current nonsteroidal anti-inflammatory drug (NSAID) use, and ideally a recent C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR) from bloodwork.
  3. A simple food diary. One line per day: what was eaten, stiffness on waking (0–10), fatigue (0–10), flares.
  4. Medications unchanged. NSAIDs, biologics, and DMARDs continue exactly as prescribed; the diet is an addition, not a replacement, because untreated active ankylosing spondylitis can fuse the spine (see Limits and Risks below).
  5. Weight loss is the main risk for some. For people who already eat a very restricted diet or are underweight, cutting all starch can take off too much weight, and losing too much weight on an ankylosing spondylitis diet is counterproductive.
  6. At week 6–8, the BASDAI is re-scored and C-reactive protein/erythrocyte sedimentation rate re-checked, then compared with the baseline. People whose numbers have not moved usually stop there: the diet is cheap but it isn't free, and an 8-week fair test is considered plenty.
A three-step sequence people use to test the low-starch diet on themselves: record a baseline BASDAI, morning stiffness, NSAID use and ideally CRP and ESR; follow the diet strictly for 6 to 8 weeks with a one-line daily food diary; then re-score and compare; the path then forks, toward signs it is working such as BASDAI down at least 50 percent or 2 points from baseline, or toward stopping if nothing moved, with medications unchanged throughout. A TRIAL OF ONE: TESTING THE LOW-STARCH DIET measuring first, changing one thing, measuring again — the numbers decide WEEK 0 WEEKS 0–8 WEEK 6–8 A BASELINE FIRST STRICT LOW-STARCH WEEKS RE-SCORED, COMPARED BASDAI score, morning stiffness current NSAID use ideally a recent CRP and ESR 6–8 weeks of strict adherence a one-line food diary every day: stiffness 0–10, fatigue 0–10, flares BASDAI again CRP and ESR again against one’s own baseline DID ANYTHING MOVE? SOMETHING MOVED signs it is working, in some combination: BASDAI down at least 50% or 2 points (of 10) morning stiffness 60–90 min falling toward 15–30 min lower CRP and ESR on follow-up bloodwork fewer bad days per week, in the food diary lower NSAID need without worse pain NOTHING MOVED → ENDED after 8 strict weeks the diet is probably not the lever and that is useful information too: AS is heterogeneous, and not every patient's disease is driven by the same gut biology the diet is cheap, but it isn't free throughout: NSAIDs, biologics and DMARDs kept as prescribed — the diet is additive, not a replacement

Low-Starch vs Keto vs AIP vs Mediterranean

Patients often conflate these, but they are very different protocols:

The low-starch diet is by far the least restrictive of the four — if you can give up bread, pasta, potato, and rice, you can keep almost everything else on your plate. That's also why it's easier to sustain for the long run.

Foods the Diet Cuts

Foods Allowed Generously

A Practical Sample Day

Notice there is no bread, rice, pasta, or potato — but the plate looks full, and nobody feels deprived. That's the point. A sustainable ankylosing spondylitis diet is one you can eat for years, not one you abandon in a month.

Supplements Often Paired

Ebringer did not build a supplement protocol into the diet, but patients and modern integrative rheumatologists commonly add:

None of these are substitutes for disease-modifying therapy. They are add-ons.

Signs It's Working

People who try the diet usually give it 6–8 weeks of strict adherence before judging it. Those who report a benefit typically describe some combination of:

If none of those move after 8 strict weeks, the diet is probably not that person’s lever. That is useful information too — ankylosing spondylitis is heterogeneous, and not every patient's disease is driven by the same gut biology.

Limits and Risks

Honesty again:

What Researchers Are Watching

The gut-joint axis in ankylosing spondylitis is one of the hotter areas of rheumatology research right now. Developments worth tracking:

It is entirely possible that within a decade some modernized version of Ebringer's central intuition — feed the right microbes, starve the wrong ones, and ankylosing spondylitis calms down — will be standard adjunctive care. It is also possible the specific starch-Klebsiella story will be superseded by something more granular. Either way, Ebringer asked the right question forty years early.

Key Research Papers

  1. Costello ME, et al. Brief report: intestinal dysbiosis in ankylosing spondylitis. Arthritis Rheumatol. 2015;67(3):686–691. — doi:10.1002/art.38967
  2. Breban M, et al. Faecal microbiota study reveals specific dysbiosis in spondyloarthritis. Ann Rheum Dis. 2017;76(9):1614–1622. — doi:10.1136/annrheumdis-2016-211064
  3. Rashid T, Ebringer A. Ankylosing spondylitis is linked to Klebsiella — the evidence. Clin Rheumatol. 2007;26(6):858–864. — doi:10.1007/s10067-006-0488-7
  4. Ebringer A, Rashid T, Wilson C. Rheumatoid arthritis, Proteus, anti-CCP antibodies and Karl Popper. Autoimmun Rev. 2010 (molecular-mimicry framework paper). — doi:10.1016/j.autrev.2009.10.006

PubMed Topic Searches

For further reading, the following PubMed topic searches return peer-reviewed work on the Ebringer hypothesis, the low-starch diet, and the ankylosing spondylitis gut microbiome:

  1. PubMed: Ebringer, Klebsiella, and ankylosing spondylitis
  2. PubMed: Low-starch diet and ankylosing spondylitis
  3. PubMed: HLA-B27 and the gut microbiome
  4. PubMed: Klebsiella pneumoniae and spondylitis
  5. PubMed: Molecular mimicry in ankylosing spondylitis
  6. PubMed: Gut-joint axis and spondyloarthritis
  7. PubMed: Probiotics and ankylosing spondylitis
  8. PubMed: Fecal microbiota transplantation in spondyloarthritis

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Connections

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