re: Why do so many have Celiac disease?

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They don't

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This.

A lot of people simply want something to make themselves appear “special” and to garner sympathy.

This is a quote from a news article about your question:

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A recently published study in the journal Digestion found that 86 percent of individuals who believed they were gluten sensitive could tolerate it. Individuals with celiac disease, a hereditary autoimmune condition that affects about 3 million Americans, or roughly 1 percent of the population, must avoid gluten.

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LINK