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6% of the United States population is low or deficient in the fat-soluble vitamin D. Vitamin D acts like a steroid hormone in your body that facilitates normal immune system functioning. Low levels of vitamin D have been tied to various respiratory diseases and viral illnesses. Fish and fish products like cod liver oil are some of the best dietary sources of vitamin D, with tasty fish like herring and salmon in the lead. Smoked salmon, anyone?If you don’t eat fatty fish regularly or get much sunshine, you might consider taking a vitamin D supplement. 5. Protecting Vision and Preventing DegenerationEvidence suggests fish and omega-3 fatty acids could protect against age-related macular degeneration (AMD)—a leading cause of blindness and vision loss that predominantly affects older adults. For example, one study showed regular fish intake was associated with a 42% reduced risk
of AMD in women. The lower risk of autoimmune disease could be due to the omega-3 fatty acids and vitamin D found in fish and fish oils. 6. Reduced Risk of Autoimmune DiseaseAutoimmune diseases happen when
your immune system mistakenly attacks and destroys healthy tissues in your body.