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Yale University researchers may have just discovered one trigger for the myriad and mysterious range of auto-immune diseases. And it’s probably in your pantry. In their study, mice that ate salty meals produced T cells that attacked other immune-system cells. When you consume excess sodium, these harmful T cells may form in your gut and move throughout your body, causing diseases in other organs, says study author Dr David Hafler. His team will conduct research on people next – but until then, try limiting yourself to one teaspoon or less of sodium a day.