I try very hard to be gluten free (2 1/2 yrs) but also have to avoid dairy, so have trouble sometimes figuring out what has caused what symptom. I do know that if I have accidentally eaten gluten I get bad joint pain for about a day and for that day and at least one more day I am exhausted. Incredibly body tired (not always sleeping tho). There has to be some connection. I know when I am "clean" I feel better than I have ever felt in my entire adult life and have WAY more energy.