Your source is a Guardian Article? With a couple of quotes and a term coined 12 years ago. As far as I can see, it does not suggest that being on a gluten free diet or trying to eat healthily is a mental illness, just that there is a term for people who do obsess about eating healthily to the point where it causes harm.
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The most difficult thing is the decision to act, the rest is merely tenacity Amelia Earhart
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