News tagged with vitamin
Despite previous studies touting its benefit in moderating gout risk, new research reveals that vitamin C, also known ascorbic acid, does not reduce uric acid (urate) levels to a clinically significant degree in patients ...
Health May 16, 2013 | 1 / 5 (1) | 1
Exposing skin to sunlight may help to reduce blood pressure, cut the risk of heart attack and stroke – and even prolong life, a study suggests.
Health May 07, 2013 | 5 / 5 (2) | 1
Preterm infants may need to be given 800 international units (IU) of vitamin D a day to ensure they develop strong bones, according to a study to be presented Sunday, May 5, at the Pediatric Academic Societies (PAS) annual ...
Pediatrics May 05, 2013 | not rated yet | 0
Pregnant women are advised not to smoke during pregnancy because it can harm the baby's lungs and lead to wheezing and asthma, among other problems. If a woman absolutely can't kick the habit, taking vitamin C during pregnancy ...
Pediatrics May 04, 2013 | not rated yet | 0
In recent years, healthy people have been bombarded by stories in the media and on health websites warning about the dangers of too-low vitamin D levels, and urging high doses of supplements to protect against everything ...
Health May 01, 2013 | 3 / 5 (4) | 3
Researchers claim to have calculated for the first time, the upper safe limit of vitamin D levels, above which the associated risk for cardiovascular events or death raises significantly, according to a recent study accepted ...
Health Apr 30, 2013 | 2.5 / 5 (2) | 0
(Medical Xpress)—Vitamin therapy is a promising avenue to improving symptoms of pain, tingling and numbness in hands and feet typical of diabetic neuropathy, a study by Tulane University researchers concluded.
Diabetes Apr 29, 2013 | 5 / 5 (2) | 0
In a comparison of the effect of different dosages of vitamin D supplementation in breastfed infants, no dosage raised and maintained plasma concentrations within a range recommended by some pediatric societies. However, ...
Health Apr 30, 2013 | not rated yet | 0 |
With the remains of a recent lottery winner having been exhumed for foul play related to cyanide poisoning, future winners might wonder what they can do to avoid the same fate. A new report in The FASEB Journal involving zebrafish ...
Medical research Apr 30, 2013 | 5 / 5 (1) | 0
(HealthDay)—Every newborn infant, including those born at home, is entitled to appropriate care, according to a policy statement issued by the American Academy of Pediatrics (AAP) and published online April ...
Pediatrics Apr 29, 2013 | 1 / 5 (1) | 0
(HealthDay) -- Vitamin E may stimulate cells that result in bone loss, a new study suggests.
Medical research Mar 04, 2012 | 4.4 / 5 (7) | 2 |
For decades before antibiotics became generally available, sunshine was used to treat tuberculosis, with patients often being sent to Swiss clinics to soak up the sun's healing rays. Now, for the first time scientists have ...
Diseases, Conditions, Syndromes Sep 03, 2012 | 5 / 5 (5) | 0 |
(Medical Xpress)—Anticoagulants have saved the lives of those at risk for heart attack or stroke. However, because they prevent blood clotting, they can be dangerous to patients who suffer traumatic injuries or who require ...
Medical research Mar 05, 2013 | 5 / 5 (2) | 0 |
Niacin, or vitamin B3, is the one approved drug that elevates "good" cholesterol (high density lipoprotein, HDL) while depressing "bad" cholesterol (low density lipoprotein , LDL), and has thereby attracted much attention ...
Medical research Apr 09, 2012 | 4 / 5 (4) | 0 |
As people move more often and become more urbanized, skin color—an adaptation that took hundreds of thousands of years to develop in humans—may lose some of its evolutionary advantage, according to a Penn State anthropologist.
Health Feb 16, 2013 | 4 / 5 (1) | 2
A vitamin is an organic compound required as a nutrient in tiny amounts by an organism. A compound is called a vitamin when it cannot be synthesized in sufficient quantities by an organism, and must be obtained from the diet. Thus, the term is conditional both on the circumstances and the particular organism. For example, ascorbic acid functions as vitamin C for some animals but not others, and vitamins D and K are required in the human diet only in certain circumstances. The term vitamin does not include other essential nutrients such as dietary minerals, essential fatty acids, or essential amino acids, nor does it encompass the large number of other nutrients that promote health but are otherwise required less often.
Vitamins are classified by their biological and chemical activity, not their structure. Thus, each "vitamin" may refer to several vitamer compounds that all show the biological activity associated with a particular vitamin. Such a set of chemicals are grouped under an alphabetized vitamin "generic descriptor" title, such as "vitamin A," which includes the compounds retinal, retinol, and many carotenoids. Vitamers are often inter-converted in the body.
Vitamins have diverse biochemical functions, including function as hormones (e.g. vitamin D), antioxidants (e.g. vitamin E), and mediators of cell signaling and regulators of cell and tissue growth and differentiation (e.g. vitamin A). The largest number of vitamins (e.g. B complex vitamins) function as precursors for enzyme cofactor bio-molecules (coenzymes), that help act as catalysts and substrates in metabolism. When acting as part of a catalyst, vitamins are bound to enzymes and are called prosthetic groups. For example, biotin is part of enzymes involved in making fatty acids. Vitamins also act as coenzymes to carry chemical groups between enzymes. For example, folic acid carries various forms of carbon group – methyl, formyl and methylene - in the cell. Although these roles in assisting enzyme reactions are vitamins' best-known function, the other vitamin functions are equally important.
Until the 1900s, vitamins were obtained solely through food intake, and changes in diet (which, for example, could occur during a particular growing season) can alter the types and amounts of vitamins ingested. Vitamins have been produced as commodity chemicals and made widely available as inexpensive pills for several decades, allowing supplementation of the dietary intake.
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