Yes it is possible to have adult-onset Celiac.
If you have Lyme, most experts agree a gluten-free diet can be very helpful for reducing symptoms and improving recovery. Note that Lyme has been known to cause a false positive ANA...
If you have Lupus or another similar autoimmune disorder (and some believe chronic infections can cause such disorders), it is also a good idea to go gluten-free...
Gluten proteins promote inflammation even in those who do not have Celiac Disease.
Chronic Lyme, Bart., Gluten & Sulfite Sensitivity, Many Food/Inhalant/Medication/Chemical Allergies & Intolerances, Asthma, Gut dysmotility & non-specific inflammation, Lupus, Osteoporosis, etc.; G-Tube; TPN-dependent
Meds: Flagyl, Cefazolin, Zofran, Essential Oils, etc.