I follow a yeast-free diet to control an auto-immune disease called Hidradenitis suppurativa. Some doctors produced a study a while back where they found anti-Saccharomyces cerevisiae autoantibodies in HS patients. When patients followed a yeast and wheat-free diet they would see 100% remission of symptoms. The hardest part of following this diet is avoiding yeast as it is a major flavor component in almost all "ultra-processed foods", especially the "healthy" ones. Vegan and plant-based foods add yeast proudly. The problem is that our bodies have an innate immune system that is coded to recognize and fight fungi. Our DNA even codes for pattern recognizers that specifically target saccharomyces cerevisiae, also known as bread/baker's yeast. It's alarming to me that scientists know with certainty that yeast is innately inflammatory, and that inflammation is the majorcause of chronic disease, but have not put it together that maybe yeast should be avoided as a food additive.
Not exactly the same, but my dad has (diagnosed) celiac disease and, being stubborn, refused to adhere to the diet. He had early onset vascular dementia within a couple of years (no history of this in the family). Eating wheat when you have celiac disease is similarly inflammatory, it seems, and can cause all sorts of seemingly unrelated problems.
For me, the diet puts HS completely into remission. I've been on the yeast and wheat-free diet for about six years. While the diet is hard to follow, I never have any boils, sinus tracts or any skin inflammation. Also happily (and anecdotally) I no longer experience headaches or migraines of any kind.
