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Is Gluten Intolerance Related to Psoriatic Arthritis?

A good friend of mine recently switched to a gluten-free diet and claims that it has made a big difference in her eczema symptoms. She says that all sorts of conditions are related to gluten intolerance and that cutting gluten out of my diet will almost certainly help my psoriasis and psoriatic arthritis.
I tend not to believe claims such as these, but I'm certainly open to trying any natural treatment for my condition that has been proven to be effective. Is gluten intolerance related to psoriatic arthritis? If so, what is the connection between the two?

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Studies have found that people with psoriatic arthritis have an increased prevalence of antibodies to gliadin (AGA) as compared to the general population. An increased level of gliadin antibodies (AGA-positive) is a predictor of gluten intolerance and has also been linked to more severe psoriasis symptoms.
One study has shown that switching to a gluten-free diet for people with both psoriasis and a positive AGA test can lead to improved symptoms. However, the study also found that for people who have psoriasis but are not AGA-positive, a gluten-free diet did not improve symptoms. It is uncertain at this point what the exact correlation is between the two diseases, and more studies need to be done to clarify the relationship between them.
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