[T. P. Pole]

Yes, but what are all the folks trying to make a buck off the gluten-free fad going to do if this gets cured?

I mean, really, you need a big label on my orange juice declaring it to be gluten free?

[Tax-chick]

Do you really need a label declaring your orange juice Kosher?

I agree, gluten-free is a fad and a swindle in most cases. Celiac disease is a major exception to the basic human ability to digest bread products.

[mountainbunny]

Since orange juice is often concentrated and stored, then reconstituted using shared equipment, yes.

Anything over 20 parts per million is not gluten free. Shared equipment would push it far over 20 ppm, so a label that says gluten free actually tells me something I need to know to avoid becoming seriously ill.

[Heart-Rest]

"I mean, really, you need a big label on my orange juice declaring it to be gluten free?"

It can't hurt you to know that a particular product is "gluten-free", and it can be very helpful to a person who has some kind of problem with gluten.   It is similar to a product with no sugar, or low-sugar content, which may mean nothing to most people, but can be extremely helpful for diabetic shoppers (who need to restrict the amount of sugar they consume) to be made aware of the sugar content right there in big bold letters on the label.

While most orange juice on the market may be gluten free, there are some beverages which do contain gluten, as well as many other food products which one might not at first suspect as containing gluten.

One food item which contains gluten, even if you might not suspect that at first, is "Twizzlers" candy, believe it or not.

Gluten can come from rye and barley, as well as wheat.   Many foods contain an additive called "maltodextrin", and some types of maltodextrin can contain gluten, while other types of maltodextrin are gluten-free.   It is very helpful to know from a simple inclusion of "Gluten Free" on the label that a food item does not contain any of these kinds of gluten.

Here is a web site which lists some food items which you might not at first suspect contain gluten, but which do actually contain it.

Surprising Foods That Contain Gluten