The video explains this Mayo Clinic study of blood samples saved from the 1950s. Celiac is about five times as common today as then and we don’t know why. Clearly human genetic makeup hasn’t changed in that period of time, so it has to be something environmental. And it is both so common now and so likely to impact survivability if undiagnosed that they are studying whether to switch from testing when symptoms present to general population screening the way we do for cholesterol. Right now about 1% of the population have celiac and most of them don’t know it.
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