Yes, exactly. And forget about restaurants (unless they specifically cater to gluten-free [and even then, you’re playing roulette]).
And yes, 100%, unprocessed fruits, veggies, eggs, dairy, and meat products from the perimeter of the grocery store are the safest. Cooking most things from scratch is the best strategy.
Even then, again, sometimes meats are pre-seasoned or brined. Ya gotta be careful and diligent.
Look, eating a mostly from-scratch “Paleo” or “Weston A. Price” diet is objectively the best way to go for everybody, Celiac or not, vegan or carnivore. Nobody disagrees that unprocessed farm foods are better than factory food snacks. Alas, cooking every damned meal every day when you have a career and other obligations is tough. Processed foods do find their way in.
You do the best you can, and diligently read every label, building a list of the “good guy” brands. (For what it’s worth, Siete and Primal Kitchen are fucking godsends. Goddamn we love Siete).
Oh fuck antivaxxers