Yeast extract

[JoJo0611]

Please can anyone help. I was diagnosed on 23rd December and I am trying my best to get my head around all the things to look out for. I have read that yeast extract is not to be eaten by coeliacs. Why? And is this all yeast extract. Or is this information wrong. Thanks. 

[Scott Adams]

Here is some more info on this:

 

[YoshiLuckyJackpotWinner888]

On 1/19/2026 at 2:44 PM, JoJo0611 said:

Please can anyone help. I was diagnosed on 23rd December and I am trying my best to get my head around all the things to look out for. I have read that yeast extract is not to be eaten by coeliacs. Why? And is this all yeast extract. Or is this information wrong. Thanks. 

I was diagnosed celiac 5 years ago. One of my blood work panels showed saccaromyces cervesiae IgG sensitivity in that same year. Back when I searched this issue out, it occurred to me then, based on a research paper written about similarities between yeast and gluten, that human genetics might have  evolved a gene to detect and create a immune defense against Candida albicans or other similar invasive fungal species. Yeast used in foods or commonly food with certain foods such as saccaromyces might be similar enough to Candida to be affected, even though they do not present as the same threat. It looked to me like gluten was similar also in chemical structure. If celiac exists because of an evolutionary mutation to defend against candida, I might have been the first to express this possibility in this thread.

If this sounds too far fetched, I will quote AI on this, which I didn’t have access to 5 years ago when this all occurred to me. 

quote”

Candida albicans can trigger the production of tissue transglutaminase (tTG) antibodies, often causing false-positive results for celiac disease. The Candidafungus binds to and mimics the tTG enzyme in the gut, inducing an immune response similar to that seen with gluten. This cross-reactivity links Candida overgrowth to potential intestinal damage, inflammation, and autoimmune

Key Connections Between tTG Antibodies and Candida

Immune Mimicry: 

Candida albicans

 possesses a cell-wall protein called Hwp1, which has similar amino acid sequences to human tTG and gluten, causing the immune system to react to both the fungus and the enzyme.

False Positives for Celiac Disease: High levels of anti-tTG antibodies, typically used to diagnose celiac disease, can be produced due to Candida infection, creating potential for misdiagnosis.

Gut Health Impact: Candida can bind to tTG in the gut, which may increase permeability ("leaky gut"), contribute to chronic inflammation, and trigger immune dysregulation.

Shared Pathophysiology: Both Candida and celiac disease share mechanisms where the immune system attacks the gut lining, often involving similar antibody responses.“

[Scott Adams]

It’s understandable to look for bigger explanations when you’re dealing with complex symptoms, but the current scientific consensus does not support the idea that celiac disease evolved as a defense against Candida. Celiac disease is a well-characterized autoimmune condition triggered specifically by gluten in genetically susceptible individuals (HLA-DQ2 or HLA-DQ8). While some laboratory studies have shown that certain Candida proteins (like Hwp1) share limited sequence similarities with gluten or tissue transglutaminase (tTG), that does not mean Candida causes celiac disease or commonly produces false-positive tTG tests in clinical practice.

Anti-tTG IgA remains a highly specific and validated marker for celiac when used appropriately (especially alongside total IgA testing and, when indicated, biopsy). IgG antibodies to Saccharomyces cerevisiae (ASCA) are more commonly associated with Crohn’s disease and are not considered diagnostic for celiac.

There is ongoing research into microbiome interactions and immune cross-reactivity, but at this time there is no evidence that yeast exposure from foods triggers celiac autoimmunity in people without gluten exposure. If symptoms persist despite a strict gluten-free diet, it’s best to work with a gastroenterologist to rule out other conditions such as IBD, SIBO, non-celiac food intolerances, or refractory celiac disease rather than assuming a fungal-driven mechanism.

[K M Wade]

It appears that you're confusing "yeast" with "yeast extract." Yeast extract is used in many commercially produced foods as a flavor enhancer. If the yeast extract is derived from wheat, then no, it must be avoided by celiacs. If, however, it is derived from corn, then yeast extract is safe for you to eat.