“I think I’m sensitive to gluten” gets said a lot, and it covers two genuinely different things happening in the body. One is celiac disease — a specific autoimmune reaction where the immune system attacks the gut lining. The other is non-celiac gluten sensitivity, which causes real symptoms through a different mechanism entirely, without the same autoimmune attack. They’re not just different severities of the same problem. They trace back to different genes.
That distinction turns out to matter a lot for figuring out what’s actually going on if gluten never seems to sit right with you.
The Report Decoder series
This is one in a series where we take the massive, genuinely complicated health reports that services like SelfDecode generate from a DNA sample, and translate them into something you can actually read in five minutes. No spreadsheets of gene variants, no clinical percentiles — just what the report is actually telling you, and why it matters. Explore the rest of the series here.
Today’s topic: the Gluten Sensitivity report, which zooms in specifically on the HLA genes behind celiac disease and the separate genetic markers linked to non-celiac gluten sensitivity.
The part that surprised us: one gene variant does most of the heavy lifting
A lot of genetic predispositions are the sum of hundreds of small effects spread across the genome. Celiac disease isn’t like that. It’s one of the clearest examples in human genetics of a single gene region carrying most of the risk.
Here’s the twist: most of the genetic variants tied to celiac disease don’t seem to affect that second, non-celiac antibody marker at all. Researchers now think celiac disease and non-celiac gluten sensitivity likely run on largely separate genetic tracks — which is exactly why this report treats them as two different questions instead of one.
How the report actually sorts your results
Instead of drowning you in raw data, a report like this sorts each trait into one of three lanes based on your genetic tendency relative to most people:
- More likely — your genetics lean toward a higher tendency for this
- Typical — your genetics land in the ordinary range
- Less likely — your genetics lean toward a lower tendency
Because this report is narrowly focused, it covers just four things: your non-celiac gluten sensitivity tendency, your celiac disease likelihood, your specific HLA-DQ genetics (the gene family that does most of the work in celiac disease), and a related autoimmunity gene called SH2B3 that shows up across several autoimmune conditions, not just celiac.
More likely
Typical
Less likely (typical/lower risk)
Illustrative example only — not based on any real person’s results.
The detail everyone should know before reading any genetic report
Here’s the part that doesn’t get said often enough: a “More Likely” result does not mean you’re headed for a diagnosis.
Even someone with a meaningfully elevated genetic tendency toward a rare condition is still, in absolute terms, unlikely to develop it — because the condition itself is rare across the whole population to begin with. Celiac disease affects roughly 1-2% of people; a high genetic score still leaves the overall odds fairly low.
Where results like this tend to be more genuinely useful is the reverse case: if you’ve already noticed you feel worse after eating bread or pasta, seeing which pathway your genetics point toward — the autoimmune HLA-DQ route, or the separate non-celiac antibody route — can help frame the conversation with a doctor about which tests actually make sense to run next.
What a personalized version looks like
Everything above is the general picture. A personalized Gluten Sensitivity report swaps out the general statistics for your actual results — pulled from your own DNA — across the 4 markers described above, built entirely around the HLA-DQ family and the related SH2B3 autoimmunity gene, based on an analysis of over 1 million genetic variants.
It also comes with a prioritized list of diet, supplement, and lifestyle recommendations — starting with the one intervention that actually works for confirmed gluten issues (a strict gluten-free diet), ranked alongside supporting options like targeted probiotics, based on how relevant they are to your specific results.
If any of this sounds like it explains something you’ve been dealing with