Unfortunately, it’s frequently far from that easy.
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Why Is It So Tough to Be Perfectly Gluten-Free?
It can hide in places you don’t expect, such as prescription medications and gourmet meats.

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It also can appear in trace amounts in foods that appear gluten-free by their ingredients lists.
In many cases, grain-based “gluten-free” products are top suspects.
So How Many People Are Affected By Continuing Symptoms?
That’s not clear, although there are some hints in the medical literature for people with celiac disease.
Women tended to fare worse than men.
What Can You Do If You Still Have Symptoms?
The treatment is the same for both: a strict gluten-free diet.
In many cases, though, eliminating low levels of gluten will do the trick.
Posner E; Haseeb M. National Center For Biotechnology Information StatPearls.Celiac Disease.
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The National Institute of Diabetes and Digestive and Kidney Diseases.Eating, Diet, & Nutrition for Celiac Disease.
Hauser W. et al.Predictors of Irritable Bowel-jot down Symptoms and Healthcare-seeking Behavior Among Adults With Celiac Disease.
2007 May;69(4):370-6.