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Synthesis of vitamin D in nature is dependent on the presence of UV radiation and subsequent activation in the liver and in the kidneys. Many animals synthesize vitamin D 3 from 7-dehydrocholesterol, and many fungi synthesize vitamin D 2 from ergosterol. [46] Vitamin D 3 is produced photochemically from 7-dehydrocholesterol in the skin of most ...
They occur naturally in most eukaryotes, including plants, animals, and fungi, and can also be produced by some bacteria (however likely with different functions). [ 2 ] [ 3 ] The most familiar type of animal sterol is cholesterol , which is vital to the structure of the cell membrane , and functions as a precursor to fat-soluble vitamins and ...
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).
The "fat-soluble" vitamins (A, D, E and K) – which are isoprene-based lipids – are essential nutrients stored in the liver and fatty tissues, with a diverse range of functions. Acyl-carnitines are involved in the transport and metabolism of fatty acids in and out of mitochondria, where they undergo beta oxidation . [ 77 ]
The yolk makes up about 33% of the liquid weight of the egg; it contains about 60 kilocalories (250 kJ), three times the energy content of the egg white, mostly due to its fat content. [clarification needed] All of the fat-soluble vitamins (A, D, E and K) are found in the egg yolk. Egg yolk is one of the few foods naturally containing vitamin D.
Many plant-based milks, such as almond, soy and oat milks, are fortified with vitamin D to match the levels found in cow’s milk. A 1-cup serving of fortified plant-based milk typically contains ...
Since vitamin D 3 (cholecalciferol) and vitamin D 2 (ergocalciferol) are fat-soluble, humans and other animals with a skeleton need to store some fat. Without fat, the animal will have a hard time absorbing vitamin D 2 and vitamin D 3 , and the lower the fat percentage, the greater the risk of vitamin deficiency, which is the case in some ...
Vitamin D is a fat-soluble vitamin that promotes calcium absorption, a process that can help keep bones and muscles strong. It also can play a role in supporting the immune system. It also can ...