https://www.cookipedia.co.uk/wiki/index.php?action=history&feed=atom&title=Vitamin_AVitamin A - Revision history2026-04-16T17:11:25ZRevision history for this page on [[Cookipedia]]MediaWiki 1.45.1https://www.cookipedia.co.uk/wiki/index.php?title=Vitamin_A&diff=245263&oldid=prevChef at 16:46, 5 March 20162016-03-05T16:46:33Z<p></p>
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[[Image:Vitamin A.jpg|thumb|300px|right|Vitamins A, C & D|alt=Vitamin A]]<br />
The discovery of '''vitamin''' A stemmed from research dating back to 1906, indicating that factors other than carbohydrates, [[proteins]], and fats were necessary to keep [[cattle]] healthy. By 1917 one of these substances was independently discovered by Elmer McCollum at the University of Wisconsin-Madison, and Lafayette Mendel and Thomas Osborne at Yale University. Since "water-soluble factor B" ([[Vitamin B]]) had recently been discovered, the researchers chose the name "[[fat]]-soluble factor A" (vitamin A). Vitamin A was first synthesized in 1947 by two Dutch chemists, David Adriaan van Dorp and Jozef Ferdinand Arens.<br />
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===Sources of vitamin A===<br />
Vitamin A is found naturally in many foods:<br />
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*'''[[liver]] (beef, pork, chicken, turkey, fish)''' (6500 μg 722%)<br />
*'''[[carrots]]''' (835 μg 93%)<br />
*'''[[Broccoli|Broccoli leaves]]''' (800 μg 89%)<br />
*'''[[sweet potatoes]]''' (709 μg 79%)<br />
*'''[[kale]]''' (681 μg 76%)<br />
*'''[[butter]]''' (684 μg 76%)<br />
*'''[[spinach]]''' (469 μg 52%)<br />
*[[vegetables|leafy vegetables]]<br />
*'''[[pumpkin]]''' (369 μg 41%)<br />
*'''[[collard greens]]''' (333 μg 37%)<br />
*'''[[Melons|cantaloupe melon]]''' (169 μg 19%)<br />
*[[egg|eggs]] (140 μg 16%)<br />
*[[apricots]] (96 μg 11%)<br />
*[[papaya]] (55 μg 6%)<br />
*[[mango]] (38 μg 4%)<br />
*[[peas]] (38 μg 4%)<br />
*[[broccoli]] (31 μg 3%)<br />
*[[winter squash]]<br />
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Note: ''bracketed values are retinol equivalences and percentage of the adult male RDA per 100g.''<br />
===Metabolic functions of vitamin A===<br />
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Vitamin A plays a role in a variety of functions throughout the body, such as:<br />
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* Vision<br />
* Gene transcription<br />
* Immune function<br />
* Embryonic development and reproduction<br />
* Bone metabolism<br />
* Haematopoiesis<br />
* Skin health<br />
* Reducing risk of heart disease<br />
* [[Antioxidant]] Activity<br />
==See also==<br />
{{SeeAlso-Vitamins}}<br />
{{CategoryLineIngredients}}<br />
[[Category:Ingredients]]<br />
[[Category:Vitamins, minerals and supplements]]<br />
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