This document discusses the relationship between various autoimmune diseases and nutrition/food. It begins by introducing common autoimmune diseases that affect different organ systems. It then discusses evidence that vitamin D deficiency is associated with increased risk of inflammatory bowel disease and rheumatoid arthritis. Food restriction is also found to lower risk of systemic lupus erythematosus. The document focuses on links between vitamin D and multiple sclerosis, finding that low vitamin D levels correlate with higher MS risk and severity. Vitamin D is thought to have immunomodulatory effects that may help prevent and treat MS. Cow's milk consumption is also discussed in relation to increased type 1 diabetes risk through potential molecular mimicry.