Those kinds of claims are “absolute hair-raising nonsense,” concludes Bernhard Hube, a biologist who studies fungal infection biology at the Hans Knoll Institute in Germany. The popular claims being made about yeast and how they affect people, he says, simply “aren’t scientifically justified.” Saying that yeast are associated with, and can perhaps aggravate, a few specific diseases in mice is very, very different from proclaiming that most people suffer a collection of vague symptoms because their bodies have been overtaken by yeast. ![]() Iliyan Iliev, a mucosal immunologist at Weill Cornell Medicine in New York City, has been investigating the link between yeast and various diseases in mice. (Crohn’s patients often have higher-than-normal levels of antibodies against components of Candida and other yeast.) The associations between yeast and other gastrointestinal conditions are still just that-associations-and so far no one knows whether the yeast play a causal role or whether changes to yeast populations might be a consequence of the conditions. ![]() With Crohn’s, researchers are careful to note there’s no evidence that fungi cause the disease-they do, however, seem to aggravate the inflammatory response, at least in mice. Some research has, for instance, linked yeast such as Candida to a few gastrointestinal conditions, including Crohn’s Disease and Graft-Versus-Host Disease. ![]() There are certainly other health issues in which yeast could play a role, too-but they are limited in scope and still quite uncertain.
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