Who would have thought that the hormone produced by the sun, vitamin D, which has been produced in various forms of life for more than 500 million years, will get such attention today and will arouse such controversy? In 1997, the Institute of Medicine (IOM) determined that all children and adults up to the age of 50 need only 200 IU of vitamin D per day to meet the needs of their bodies and maintain healthy bones.
This value comes from the research carried out in the 1940s. It was then determined that 100 IU per day is all that is needed to prevent rickets in children. The value was slightly increased and … for 50 years it seemed that 200 IU of vitamin D per day is all you need for children and adults.
In 2010, IOM reported that the RDA for vitamin D for most children and adults should be increased to 600 IU per day. This amount should be enough for 97.5% of the population. The norm was normalized and the safe upper limit was shifted from 2,000 to 4,000 IU of vitamin D per day. This suggests that in the last 50 years previous recommendations based on “evidence-based medicine” were completely inadequate.
Hoffman estimated that life in cities in 1908-1912 and at higher latitudes was associated with increased mortality due to cancer. Peller and Stephenson in the 1930s reported a worrying indicator of skin cancer in seafarers serving in the US Navy. The number of skin cancer cases was 8 times higher than in the civilian population, but the total number of deaths from other cancers was 60% lower.
Applications probably even a large dose of vitamin D does not bring significant side effects. Epidemiological data combine vitamin D deficiency with autoimmune disease, cancer, cardiovascular disease, depression, dementia, infectious diseases, musculoskeletal disorders and many others. It is worth to supplement vitamin D, especially in autumn and winter.
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