ananyo writes "The incidence of autoimmune diseases, such as multiple sclerosis and type 1 diabetes, has spiked in developed countries in recent decades. In three studies published today, researchers describe the molecular pathways that can lead to autoimmune disease and identify one possible culprit that has been right under our noses — and on our tables — the entire time: salt. Some forms of autoimmunity have been linked to overproduction of TH17 cells, a type of helper T cell that produces an inflammatory protein called interleukin-17. Now scientists have found sodium chloride turns on the production of these cells (abstract). They also showed that in a mouse model of multiple sclerosis, a high-salt diet accelerated the disease's progression (abstract)."