Although just 1% of Americans have a diagnosis of celiac disease, it's most likely vastly under-diagnosed. In fact, only 10% of people with the disease exhibit obvious GI symptoms. And research now suggests that celiac disease can present itself strictly as a neurological problem.
In reality, celiac disease is the extreme end of the gluten sensitivity-autoimmune spectrum — there's also an estimated 1 in 20 Americans living with what's called non-celiac gluten sensitivity.