HUMAN NUTRITION

Detailed explanation-1: -Very few foods naturally have vitamin D. Fatty fish such as salmon, tuna, and mackerel are among the best sources. Fortified foods like milk provide most of the vitamin D in American diets.

Detailed explanation-2: -Vitamin D deficiency is more common than you might think. Globally, studies suggest roughly one billion¹ people are vitamin D deficient. In the US alone, 42%² of adults are deficient, while 50%³ of children aged between one and five and 70% of children aged between six and 11 have low vitamin D stores.