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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 ...
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.
7-DHC can be produced by animals and plants via different pathways. It is not produced by fungi in significant amounts. It is made by some algae, but the pathway is poorly understood. [11] Industrially, 7-DHC generally comes from lanolin, and is used to produce vitamin D3 by UV exposure. [12] Lichen (Cladonia rangiferina) is used to produce ...
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 ...
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 ...
Full fat milk contains about 33 grams of fat per liter, including about 19 grams of saturated fat, 1.2 grams of omega 6 fatty acids, and 0.75 grams of omega 3 fatty acids per liter. The amount of fat varies for products where (some of) the fat has been removed, such as in skimmed milk.
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]
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 ...