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Schizophrenia Health Center

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Gluten Intolerance Linked to Schizophrenia

But Only Small Subset of Patients Probably Have the Digestive Disorder
By
WebMD Health News

Feb. 20, 2004 -- Intriguing early research suggests that people with a genetic intolerance to gluten may also be at increased risk for schizophrenia. Investigators say the link, if proven, could lead to new treatment options for a small subset of schizophrenic people.

Using a Danish health registry, researchers from John's Hopkins University's Bloomberg School of Public Health found people with the genetic digestive disorder known as celiac disease to be three times as likely as the general population to develop schizophrenia. Lead researcher William W. Eaton, PhD, says the next step is to determine if following a gluten-free diet makes a difference in the symptoms of schizophrenic people with celiac disease. He estimates that 3% of schizophrenic people could potentially benefit from such a diet.

Celiac disease is a lifelong (chronic) condition in which foods that contain gluten damage the small intestine. Gluten is a form of protein found in some grains (notably wheat, barley, and rye). The damage to the intestine makes it hard for the body to absorb nutrients, especially fat, calcium, iron, and folate, from food.

"We can now screen for celiac disease, so it is at least conceivable that we can locate the folks with schizophrenia for whom gluten withdrawal might work," he tells WebMD. "But we still have to do those studies."

More Study Needed

Eaton and colleagues examined the medical histories of 7,997 schizophrenics admitted to a Danish psychiatric facility between 1981 and 1998. For each case they identified 25 people without the mental disorder, matched by sex and year of birth.

The researchers found no differences in the rates of other digestive disorders such as Crohn's disease and ulcerative colitis between the groups, yet people with schizophrenia were 3.2 times as likely to have a history of celiac disease as the comparison group. The findings are reported in the Feb. 21 issue of the British Journal of Medicine.

It is estimated that about 1% of the population of the U.S. has celiac disease. Eaton says he hopes to identify a group of people with schizophrenia who also have celiac disease and then put some of them on gluten-free diets to determine if the intervention is of therapeutic value.

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