I'm sure there are lots of other things in wine that people are allergic to. However sulphites are one of the top allergens, which is why they are included in mandatory labeling laws.
I don't particularly enjoy not being able to eat almost all dried fruit, and having to watch everything I eat. However I enjoy painful rashes on my tongue even less.
Yes allergies and sensitivities are vastly over diagnosed, and also underdiagnosed. However as there's no definitive way to diagnose allergies it's impossible to state how many people are allergic to anything. Even if it's just the placebo effect it's better than nothing.
http://www.hc-sc.gc.ca/fn-an/securit/allerg/fa-aa/index-eng.php
http://www.hc-sc.gc.ca/fn-an/pubs/securit/2012-allergen_sulphites-sulfites/index-eng.php
http://www.aaaai.org/Aaaai/media/MediaLibrary/PDF%20Documents/Practice%20and%20Parameters/food-allergy-2006.pdf
Summary Statement 53. Sulfites produce bronchospasm in
5% of the asthmatic population, in most cases due to generation of sulfur dioxide in the oropharynx. (A) Sulfite-induced anaphylaxis has also been described. (B)
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