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7-Dehydrocholesterol (7-DHC) is a zoosterol that functions in the serum as a cholesterol precursor, and is photochemically converted to vitamin D 3 in the skin, therefore functioning as provitamin-D 3. The presence of this compound in human skin enables humans to manufacture vitamin D 3 (cholecalciferol).
Foods such as the flesh of fatty fish are good natural sources of vitamin D; there are few other foods where it naturally appears in significant amounts. [2] In the U.S. and other countries, cow's milk and plant-based milk substitutes are fortified with vitamin D 3, as are many breakfast cereals.
Humans require thirteen vitamins in their diet, most of which are actually groups of related molecules (e.g. vitamin E includes tocopherols and tocotrienols): [20] vitamins A, C, D, E, K, thiamine (B 1), riboflavin (B 2), niacin (B 3), pantothenic acid (B 5), pyridoxine (B 6), biotin (B 7), folate (B 9), and cobalamin (B 12). The requirement ...
Since Vitamin D is a fat-soluble vitamin, it cannot be added to a wide variety of foods. Foods that it is commonly added to are margarine, vegetable oils and dairy products. [ 34 ] During the late 1800s, after the discovery of curing conditions of scurvy and beriberi had occurred, researchers were aiming to see if the disease, later known as ...
Animal-source foods are a diverse group of foods that are rich in bioavailable nutrients including calcium, iron, zinc, vitamins B12, vitamin D, choline, DHA, and EPA. [11] Animal-source and plant-based foods have complimentary nutrient profiles and balanced diets containing both reduce the risk of nutritional deficiencies. [ 11 ]
A glass of cow milk Cows in a rotary milking parlor. Milk is a white liquid food produced by the mammary glands of mammals. It is the primary source of nutrition for young mammals (including breastfed human infants) before they are able to digest solid food. [1] Milk contains many nutrients, including calcium and protein, as well as lactose and ...
milk [1] Cow milk (whole) [2] Soy milk (unsweetened) [3] Almond milk ... Vitamin B 12 (mcg) 0.1 1.10 2.70 0 1.2 Vitamin A (IU) 522 395 [b] 503 [a] 372 [a] - Vitamin D ...
Modified dry whole milk, fortified with vitamin D.This is the original container from 1947, provided by the Ministry of Food in London, England.. While Marco Polo wrote of Mongolian Tatar troops in the time of Kublai Khan who carried sun-dried skimmed milk as "a kind of paste", [3] the first modern production process for dried milk was invented by the Russian doctor Osip Krichevsky in 1802. [4]