I thank you for posting this - I've been here too long I think!!
Giggle! I'm forgetting to post things like this. There is just sooo much information to try to pass on to everyone that it takes us all.
As you said, many have gluten sensitivities and don't even know it! It's always best to do the gluten challenge before assuming that you aren't gluten intolerant!
When I did my gluten challenge, I discovered that I wasn't sensitive to gluten, but to yeast! I had to avoid things with yeast in them for a very long time, even though I had no signs of Candida. So the gluten challenge can turn up things that a person may need to be aware of besides gluten too!