Many people believe themselves to be gluten intolerant, without a positive result on tests (so called nonceliac gluten sensitivity). These people may instead react to carbohydrates (fructans and galactans) in wheat.
Nutrition Journal: The relation between celiac disease, nonceliac gluten sensitivity and irritable bowel syndromeWhich prompted this tweet from Dr. Ted Naiman:
@tednaiman (more support for my secret belief: real power of the Paleo diet lies in carbohydrate restriction-don't tell anyone I said that)
- Ted Naiman (@tednaiman) September 24, 2015