In addition, new FDA labeling rules provide standards and a safe harbor for manufacturers to label products as gluten free. In a bow to the interests of manufacturers though, gluten free need not be completely gluten free but can have minor traces.
For especially impaired celiacs like me, even minor traces of gluten causes problems, so a gluten free marking is less an assurance than an invitation to careful scrutiny of the detailed list of ingredients.
Is all I know is that if I avoid gluten I dont have the problem that I do otherwise. My Dr said that it can be very difficult to prove exactly what is making the difference, whether it is gluten or something else. Whatever.What I do know is that Im happier not having to worry about the problem.