Vitamin b good for weight loss
Ascorbate and ascorbic acid are both naturally present in the body when either of these is introduced into cells, since the forms interconvert according to pH. Vitamin C is an essential nutrient for certain animals including humans. Vitamin A deficiency can occur as either a primary or a secondary deficiency. Further information: Vitamin C and the common cold. Chemical structure of retinol, one of the major forms of vitamin A. Vitamin C describes several vitamers that have vitamin C activity in animals, including ascorbic acid and its salts, and some oxidized forms of the molecule like dehydroascorbic acid. Retinol, the form of vitamin A absorbed when eating animal food sources, is a yellow, fat-soluble substance. Vitamin C, also known as ascorbic acid and L -ascorbic acid, is a vitamin found in food and used as a dietary supplement. Vitamin A can be found in two principal forms in foods. In foods of animal origin, the major form of vitamin A is an ester, primarily retinyl palmitate, which is converted to retinol (chemically an alcohol ) in the small intestine. Although the results in humans were not statistically significant, this study is often cited as evidence that high doses of Vitamin C have an adverse effect on exercise performance. A study in rats and humans suggested that adding Vitamin C supplements to an exercise training program lowered the expected effect of training on VO2 Max. The carotenoid beta- cryptoxanthin possesses an ionone group and has vitamin activity in humans. A primary vitamin A deficiency occurs among children and adults who do not consume an adequate intake of provitamin A carotenoids from fruits and vegetables or preformed vitamin A from animal and dairy products. In a group of spontaneously aborting women at the end of the first trimester, the mean values of vitamin C were significantly higher in the aborting group. With the higher doses, toxic manifestations were observed in five adults and four infants. Vitamin A is a fat-soluble vitamin and depends on micellar solubilization for dispersion into the small intestine, which results in poor use of vitamin A from low-fat diets.
All species that do not synthesize ascorbate require it in the diet. The signs and symptoms in adults were nausea, vomiting, diarrhea, flushing of the face, headache, fatigue and disturbed sleep. Ascorbate is required for a range of essential metabolic reactions in all animals and plants. Ascorbate is also not synthesized by many species of birds and fish. Alpha-carotene and gamma-carotene also have a single retinyl group, which give them some vitamin activity. Two meta-analyses evaluated the effect of vitamin C supplementation on the risk of colorectal cancer. For the form usually used as a supplement, see Retinol. The biological role of ascorbate is to act as a reducing agent, donating electrons to various enzymatic and a few non-enzymatic reactions. This article is about the family of vitamers. All forms of vitamin A have a beta-ionone ring to which an isoprenoid chain is attached, called a retinyl group. Secondary vitamin A deficiency is associated with chronic malabsorption of lipids, impaired bile production and release, and chronic exposure to oxidants, such as cigarette smoke, and chronic alcoholism. Early weaning from breastmilk can also increase the risk of vitamin A deficiency. Since the pure alcohol form is unstable, the vitamin is found in tissues in a form of retinyl ester. Relatively large doses of ascorbic acid may cause indigestion, particularly when taken on an empty stomach. The retinol form functions as a storage form of the vitamin, and can be converted to and from its visually active aldehyde form, retinal. None of the other carotenes have vitamin activity.
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