A study using frozen blood samples taken from Air Force recruits 50 years ago has found that intolerance of wheat gluten, a debilitating digestive condition, is four times more common today than it was in the 1950’s.

The findings contradict the conventional wisdom that the sharp increase in diagnoses of wheat gluten intolerance has come about because of greater awareness and detection. It now seems likely that dramatic changes in the American diet have played a role.