Slate has a pretty good article on this question.
Long story short, it fall into a category of medical problems where a true medical condition is not common, but not rare either (celiac disease or gluten enteropathy affects 1% of the population and is not that hard to definitively diagnose). However, symptoms can occur that mimic the condition leading to potential for over-diagnosis and/or self-diagnosis (gluten intolerance may be "real" in a third of people who describe symptoms after gluten ingestion). In other words, if 25% of the population is on or has been on a gluten free diet, and only 1% of the population has celiac disease, there's a lot of people who are either mis-labeled with celiac disease, or just prefer not to eat gluten for a variety of reasons.
Anyhow, the Slate article is very comprehensive without rushing to judge.
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