Gluten and the Nervous System: A Pattern Worth Studying

From gluten ataxia to CIDP: a closer look at a connection that often gets missed

Over four decades of internal medicine, I cared for a handful of people with CIDP, chronic inflammatory demyelinating polyneuropathy, a disease in which the immune system attacks the coating around nerves. It’s not a common diagnosis, so a handful is about what any practitioner sees in a career. What stayed with me was gluten. Almost every one of them, at some point, tried going gluten free. Several reported feeling better, and in a few the change was striking enough to stick with me all these years later.

CIDP isn’t the only nerve condition where this shows up. It belongs to a wider and still underappreciated group of nerve and brain problems linked to gluten, many of them in people with no digestive symptoms at all. Once you start looking for that pattern, it turns up in more places than most people, including most health care practitioners, would expect.

The pattern also matters more than it used to, because gluten problems themselves are on the rise. When Mayo Clinic researchers tested blood stored from young Air Force recruits in the early 1950s and compared it with blood from men today, undiagnosed celiac disease was about four times more common in the modern samples. Nobody has measured whether gluten-related nerve disease has climbed along with it. My suspicion is that it has.

The link between gluten and the nervous system goes back decades. It started with a condition called gluten ataxia, a loss of coordination and balance caused by an immune reaction to gluten. Most of the people who had it reported no digestive symptoms, which surprised everyone at the time, because gluten problems were assumed to live in the gut. The explanation came later. In gluten ataxia the immune system goes after an enzyme called transglutaminase 6, found mainly in the brain and nervous system. That helped explain why some people had only neurological symptoms.

Other patterns followed. Nerve pain, tingling, and peripheral neuropathy, often labeled idiopathic because no cause turns up, have shown up again and again in people carrying gluten-related antibodies. Small fiber neuropathy fits the same picture. The largest study I know of came from Sweden in 2015. Researchers compared more than 28,000 people with biopsy-confirmed celiac disease against people without it and found the celiac group was about two and a half times more likely to develop neuropathy later on. CIDP was on that list too, at close to three times the usual risk.

I want to be honest about how far that goes. The CIDP numbers in that study rest on a small number of cases, and most of the other CIDP evidence is case reports. It shows an association and doesn’t prove gluten causes CIDP. Still, gluten-related nerve conditions have a track record of being dismissed for years before the research caught up, and I think CIDP is earlier on that same path.

My own view is simple. Anyone with a neurological problem that has no clear explanation deserves a real gluten-free trial, strict and long enough to matter, because nerves recover slowly. And when gluten is behind one problem, I suspect it is quietly contributing to others that haven’t surfaced yet.

So why isn’t this studied more? Much of it comes down to money. A trial of a gluten-free diet against nerve disease is hard to fund and has no company behind it. A new drug has a clear financial path. A recent television ad for a new CIDP drug, side effects read off in that familiar rapid patter, is a good example of how well that path works. Most of what practitioners are taught comes from drug research, so they are well equipped to prescribe and rarely trained to ask about diet as a root cause. Asking about gluten isn’t part of a standard neurological workup, and the question has barely been studied.

None of this argues against the newer therapies. For someone with real nerve damage, a drug that works matters, side effects and all. Treating the immune system’s attack on nerves is one question. Asking why that attack started is another, and it deserves its own research across the whole range of gluten-related neurological disease.

Stay curious and thrive,

Dr. G

Authored by Gerard Guillory, MD

Gerard Guillory, MD, is a board-certified internist who practiced for nearly four decades with a focus on functional, root-cause medicine. He is the author of three books on irritable bowel syndrome and the founder of It’s My Health, where he and his team put current health news in context and help members understand the underlying causes of chronic symptoms.