The idea known as "leaky gut syndrome" has been around since at least the 1990s. The article you found seems to be a nice summary of recent thinking (the publication date is 2011), but there doesn't yet seem to be a consensus on the role of impaired gut permeability in the development of autoimmune disorders, nor on the role of improving gut permeability in the treatment of such disorders. Did I miss some recent research on the subject?
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