> Most western diets gets more than enough d-vitamin through food additives. This is just wrong. Per capita vitamin D defficiency and insufficiency in the US

> Most western diets gets more than enough d-vitamin through food additives. This is just wrong. Per capita vitamin D defficiency and insufficiency in the US are estimated at about 30% and 40%, respectively [0] compared to about 50% insufficiency worldwide [1]. Lack of exposure to sunlight is a major predictor of vitamin D insufficiency, even in western countries [1]. Sunlight produces more bioavailable vitamin D than dietary sources, and the recommended daily vitamin D can easily be obtained from sunlight alone, while it is hard to obtain from diet alone. > Just a couple of slices of cheese per day and some milk is all the d-vit you need here apparently. Daily intake of cheese [2] and milk [3] fortified with vitamin D at the recommended daily value is insufficient to make up for a lack of sun exposure. [0] https://pubmed.ncbi.nlm.nih.gov/29644951/ https://pubmed.ncbi.nlm.nih.gov/29644951/ [1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3356951/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3356951/ [2] https://pubmed.ncbi.nlm.nih.gov/15956292/ https://pubmed.ncbi.nlm.nih.gov/15956292/ [3] https://pubmed.ncbi.nlm.nih.gov/20460232/ https://pubmed.ncbi.nlm.nih.gov/20460232/