Celiac.com 09/12/2004 - Israeli researchers conducted a study designed to determine whether or not an association exists between celiac disease and schizophrenia. Past studies have indicated that such a connection may exist. The researchers screened 50 consecutive patients over 18 years old who were diagnosed with schizophrenia and their matched controls for celiac-specific anti-endomysial IgA antibodies. All patients also completed a detailed questionnaire. There were no significant differences between the groups in gender, Body Mass Index (BMI) or country of birth, and the mean age of the study group was significantly higher than the controls. All tests for anti-endomysial antibodies in both groups were negative, and the researchers concluded that "In contrast to previous reports, we found no evidence for celiac disease in patients with chronic schizophrenia as manifested by the presence of serum IgA anti-endomysial antibodies. It is unlikely that there is an association between gluten sensitivity and schizophrenia"
This was a relatively small study that did not include other celiac disease screening methods, such as IgG (antigliadin antibody), tTG (tissue Transglutaminase), or intestinal biopsies. A recent study has shown that only 77% of those with total and 33% of those with partial villous atrophy actually have positive blood tests for celiac disease, so many cases of celiac disease may be missed by using only blood tests to screen for it. Further, about 4% of celiacs are anti-endomysial IgA deficient, so anyone in this subclass would have been missed in the study. Given such a small number of people in the study--50--if even one celiac were missed it would greatly affect the outcome of the study. Both groups should have been given much more comprehensive celiac disease screening to ensure that no cases of celiac disease were missed.
In the article by Dr. Hadjivassiliou titled Gluten Sensitivity as a Neurological Illness he says: