Based on comparisons of blood samples from the 1950s to the 1990s it seems that antibody markers of gluten sensitivity, and of celiac disease in particular, have become about 5 times more common in recent years.
It is estimated that about 1 of every 133 people has celiac disease, and of those with a relative who has celiac disease, the prevalence is even higher, as much as 1 in 22. Yet just 10 years ago or so, it was still being taught that the prevalence of celiac diasease was only about 1 in 10,000 in the US, much lower than was believed at that time to be the case in Europe.
So even if a lot of the recent awareness among the general public of gluten sensitivity has been driven by fad-chasers, there may actually be a significant increase in the number of people who would benefit for legitimate medical reasons from a gluten-free diet.
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