The document discusses the importance of omega-3 fatty acids for health. It notes that while cod liver oil contains vitamins D and A along with omega-3, the ratios of these vitamins may not be optimal. Recent studies have shown risks associated with high vitamin A intake from supplements. Omega-3 deficiency is estimated to cause 72,000-96,000 preventable deaths annually in the US. The document outlines many benefits of adequate omega-3 intake for conditions like depression, heart disease, and cognitive decline. It recommends obtaining omega-3 from fish like salmon due to concerns about mercury in other fish.