to ask why so many people are gluten free?

[waitingforsomething]

I am getting married in a few weeks and 7 of the 70 adult guests are gluten free. 10%. One of these is a coeliac the rest just don't eat it. Aibu to ask why gluten is so bad and why so many people are avoiding it? Is there evidence other than in coeliac disease that cutting it out is helpful in some way?
I don't mind from a catering point of view but I am curious as to where this is coming from.

SteveBrucesNose - I've just discovered that potato waffles can be done from frozen in a toaster. Which is just fab for my gf 7-year-old.

But re the bread thing - the gf versions have improved so much in the last couple of years. So has the pasta - it used to be really gritty and expensive, but now I just buy the Tesco stuff (about £1.40/bag) and it is fine.