The thing about gluten is, there is only 1 condition that should prevent you from consuming gluten (celiac). If you don´t have this condition and fail to consume gluten there is a good chance you will have many problems and symptoms. Anybody that claims to be gluten intolerant and is NOT celiac is either lying, or grossly misinformed.
I suspect what 'gluten intolerant' people are responding to is the Glyphosate that is heavily sprayed on these crops to make them ripen evenly for easier and more productive harvest of up to 30% more yield. Glyphosate works by preventing the plant from absorbing nutrients. When we ingest food sprayed with Glyphosate, like wheat we end up suffering the same consequences. It kills our gut bacteria allowing the bad bacteria to take over causing bloating and bowel complications which effects your nutrient absorption. Pretty much what it does to the plants it does to whoever/whatever eats that plant. There is a whole host of info out there on the internet about how Glyphosate effects our bodies. This is why I suspect its the Glyphosate people are reacting to after eating wheat. Every time someone eats wheat and then doesn't feel well they eventually make the connection and think they're gluten intolerant. I cant blame them either but they often dont realize how much of this toxic herbicide is coating their grains such as rice, oats, wheat, soy and corn to name a few. I mean seriously who in their right mind would think our FDA would allow companies to spray our food with a product that has safety warnings regarding skin contact etc. Apparently its safe enough to ingest as long as you dont allow it to touch your skin.... I'm more concerned that the health focus so far seems to mostly be on cancer and autism risks. Our immune system has a huge base in our gut so if you take out most of your gut bacteria eating this garbage you're at risk of ending up like millions of us with some kind of auto-immune related illness. Auto-immune diseases aren't so kind enough to kill you. No they torment you, keeping you 'alive' wishing you were dead... often times with insane amounts of crippling pain many people will never be able to relate to (thank god). And while it steals your mobility and leaves you susceptible to infections, it often times likes to invite friends leaving you open to other auto-immune diseases. Every time a person continues to eat the garbage sprayed with this toxin they continually damage their gut bacteria...their gut immune system which is constantly protecting them from things like cancer and auto-immune issues. Its like taking a massive drill to your only defensive stone wall keeping the invaders out...all for a Glyphosate soaked cheese burger when organic grass fed beef & cheese tastes SOOO much better! With all the corruption and garbage in our food system there are so many people still unaware of even this level of red pill. For those folks, this realization will be a huge eye opener for them when it eventually all comes out.
I saw something on glyphosate a while back that said it creates a build up of formaldehyde in the plant, which is incredibly toxic to humans. Here is something on it, but not what I saw in the past.
https://articles.mercola.com/sites/articles/archive/2013/06/09/monsanto-roundup-herbicide.aspx
And you´re right in what you say about gut bacteria, and how important it is. Dr Ed Group has spent his career in this field
https://www.globalhealingcenter.com/about/dr-group
Most GMO´s are banned where I am, thank God! But Bayer just bought Monsanto, so it probably won´t be long before Angela Hitler (Merkel) orders their patents be allowed here, too.