Tuesday, April 15, 2008

Vitamin toxicity




Definition Vitamin toxicity be a corollary roofed via which a personality pull your sock up symptom in configuration of line-up effects from taking massive dose of vitamins. Vitamins come and go in the amounts that be sought to impose toxicity and in the specific symptoms that result. Vitamin toxicity, which is also moniker hypervitaminosis or vitamin poison, is becoming more agreed in residential country because of the popularity of vitamin supplement. Many population excess themselves in support of subsidiary illnesses subsequent to life-size doses (megadoses) of vitamins.



Description Overview Vitamins are crude molecules in nurture that are needed in trifling amounts for expansion, fake, and the continuation of right condition. Some vitamins can be dissolve in grease or unfreeze stout. These fat-soluble vitamins involve vitamin D, vitamin E, vitamin A (retinol), and vitamin K. Other vitamins can be dissolved in marine. These water-soluble vitamins include folate (folic acid), vitamin B12, biotin, vitamin B6, niacin, thiamin, riboflavin, pantothenic grating, and vitamin C (ascorbic acid). Taking moreover a lot of any vitamin can discharge a poisonous effect. Vitamin A and vitamin D are the supreme potential to produce hypervitaminosis in large doses, while riboflavin, pantothenic acid, biotin, and vitamin C happen to be the smallest possible likely to cause technical hitches.



In the search, it be original observed that smashed peripheral nerves in both mice and rats released sLRP1-alpha into the encircling tissue microenvironment. Administration of sLRP1-alpha into mouse sciatic nerves prior to disaster cutback the level of injury-induced inflammatory disinterested gala in the interest environment and inhibited neuropathic pain. In vitro analysis revealed that sLRP1-alpha made to order cell particular as glial cells in favour of that aim that they do not rejoin to the inflammatory agent TNF-alpha. The journalist therefore recommend that sLRP1-alpha adapt the answer of glial cells to mediators of neuropathic pain and that it could have liberating jammy thing for individuals torment from neuropathic pain.



Vitamin megadoses With the indemnity of folic acid supplements, the preparation of taking vitamin supplements by nourishing individuals own brittle or no item to good health. Most adults in the United States can attain plenty vitamins by ingestion a well-balanced diet. It has, on the other paw, become gradually common for people to filch vitamins at levels far greater than the RDA. These soaring levels are sometimes called vitamin megadoses. Megadoses are non-hazardous for most vitamins. But in the cases of a few of the vitamins-specifically vitamin D, vitamin A, and vitamin B6-megadoses can be venomous or homicidal. Researchers have also started to appearance more charily at megadoses of vitamin C and of vitamin E, since duplicitous substantiation position readdress that these two vitamins may reduce the risk of cancer, heart disease, and aging. It is not however pardon whether megadoses of any of these vitamins has any weight by health. Some certified figure out that megadoses of vitamin C may lavish caution on people from cancer. On the other hand, other researchers have bring together indirect evidence that vitamin C megadoses may cause cancer.



Causes and symptoms Fat-soluble vitamins VITAMIN D Vitamin D and vitamin A are the most toxic of the fat-soluble vitamins. The symptoms of vitamin D toxicity are nausea, vomiting, dead in the joint, and passing of appetite. The tolerant may last out constipation alternating with diarrhea, or have tingling sensations in the orifice. The toxic dose of vitamin D depends on its frequency. In infant, a solo dose of 15 mg or greater may be toxic, but it is also the case that day after day doses of 1.0 mg completed a prolonged spell may be toxic. In adults, a daily dose of 1.0-2.0 mg of vitamin D is toxic when consumed for a prolonged period. A single dose of in the region of 50 mg or greater is toxic for adults. The instantaneous effect of an overdose of vitamin D is abdominal cramp, nausea and vomiting. Toxic doses of vitamin D taken over a prolonged period of instance result in irreversible deposit of calcium crystals in the malleable tissues of the article that may wound the heart, lungs, and kidneys.



VITAMIN A Vitamin A toxicity can transpire with long-term ingestion of 20 mg of retinol or more per hours of daylight. The symptoms of vitamin A overdose include growth of water in the common sense (hydrocephalus), vomiting, faintness, constipation, clean pain, and narrow-minded headache. The skin tone may acquire a irritating and barren aspect, with quill loss and powdery pin.



A person who have been sexually exposed to a person with lymphogranuloma venereum should be analyse for signs or symptoms of lymphogranuloma venereum, moreover as for chlamydial infection of the urethra, since the two strain of Chlamydia trachomatis can co- be at hand in an infected person. If the bring to hurricane lantern occur within 30 days of the birth of their partner's symptoms of lymphogranuloma venereum, the exposed person should be treated.



Treatment was discontinue in the early spring. Primary efficacy endpoints were depression-free rates at end-of-treatment and time-to-onset for return of a seasonal major depressive episode.



VITAMIN E Megadoses of vitamin E may produce headaches, tiredness, twofold trance, and diarrhea in human. Studies with animals feed large doses of vitamin E have revealed that this vitamin may mess about with the incorporation of other fat-soluble vitamins. The permanent status absorption procedure the move of the vitamin from the gut into the bloodstream. Thus, large doses of vitamin E consumed over frequent weeks or months may in good health result in not as much as of vitamin D, vitamin A, and vitamin K.



VITAMIN K Prolonged consumption of megadoses of vitamin K (menadione) grades in anemia, which is a reduced loftiness of red blood cell in the bloodstream. When large doses of menadione are given to infants, they result in the sediment of pigment in the brain, cheek damage, the devastation of red blood cells (hemolysis), and extermination. A daily shot of 10 mg of menadione into an infant for three days can exterminate the child. This tragic certainty be discovered during the babyhood of vitamin research, when newborn infants be inject with menadione to obviate a disease permanent as hemorrhagic disease of the newborn. Today a disparate kind of vitamin K is used to protect infants antagonistic this disease.



Water-soluble vitamins FOLATE Folate occur in various form in food. There are over a dozen connected forms of folate. The folate in oral vitamin supplements occurs in only one form, however-folic acid. Large doses of folic acid (20 grams/day) can result in eventual kidney damage. Folate is considered, however, to be relatively nontoxic, with the exception of in cases where on highest terrain folate supplementation can front to pernicious anemia.



VITAMIN B12 Vitamin B12 is ample in the treatment of pernicious anemia. Pernicious anemia is more common among middle-aged and elder adults; it is commonly detect in patients linking the ages of 40 and 80. The disease affect about 0.1% of all those in the nonspecific population in the United States, and about 3% of the elderly population. Pernicious anemia is treat with large doses of vitamin B12. Typically, 0.1 mg of the vitamin is injected all week until the symptoms of pernicious anemia peter out. The patient subsequently take oral doses of vitamin B12 for the respite of his or her natural life. Although vitamin B12 toxicity is not an issue for patients mortal treated for pernicious anemia, treatment of these patients with folic acid may cause problems. Specifically, pernicious anemia is normally opening detected because the patient consistency delicate or limp. If the anemia is not treated, the patient may suffer irreversible nerve damage. The hassle with folic acid supplements is that the folic acid treatment prevent the anemia from evolving, but allows the eventual nerve damage to occur.



The foremost symptom of gastrooesophageal reflux disease (GORD) is heartburn - a burning pain feel in the core of the treasure chest or at the flipside the sternum (breastbone). The stomach has a mucous mere liner to gawk after it from spoil with stomach acid. However, this mucous lining is out in the oesophagus, as a proceed stomach acid irritate the oesophagus, cause a burning sensation. If severe, the pain can be sturdy to detect from a heart overwhelm. Anyone who hone severe chest pain should wish denial medical guidance or call 999 in favour of an ambulance.



VITAMIN C The RDA for vitamin C in adults is 60 mg per day. Large doses of vitamin C are considered to be toxic in persons with a ancestral long-ago of or penchant to form kidney stones or gallbladder stones. Kidney and gallbladder stones usually consist of calcium oxalate. Oxalate occurs in high concentration in foods such as cocoa, sunburn, rhubarb, and spinach. A fraction of the vitamin C in the body is in general playing wakeful fur in the body to produce oxalate. A daily incorporation of 3.0 grams of vitamin C has be found to double the level of oxalate that go past through the kidneys and is excreted into the urine.



NIACIN The RDA for niacin is 15-19 mg per day in adults. Niacin come in two forms, nicotinic acid and nicotinamide. Either form can satiate the fully developed stratagem for this vitamin. Nicotinic acid, however, is toxic at levels of 100 times the RDA. It can cause inflame of the skin, nausea, diarrhea, and liver damage. Flushing is an heighten in blood say-so through the vein in the skin, in the red to the dilation of artery passing through deeper parts of the face or other parts of the body. In nastiness of the side effects, however, large doses of nicotinic acid are often used to lower blood cholesterol organized to prevent heart disease. Nicotinic acid results in a lower of LDL-cholesterol ("bad cholesterol"), an increase in HDL-cholesterol ("good cholesterol"), and a end in plasma triglycerides. Treatment involve daily doses of 1.5-4.0 grams of nicotinic acid per day. Flushing of the skin occurs as a side effect when nicotinic acid therapy is started, but may disappear with unbroken therapy.



"People with type 2 diabetes should deliberate they may have, or be at risk of sleep apnoea," he said. "It is authentic that more than partially of the people with type 2 diabetes suffer from several form of sleep muddled breathing and alert to a third have OSA at a horizontal where treatment would be recommended".



When large amounts of the water-soluble vitamins are consumed, a large fraction of the vitamin is gripped into the bloodstream and on the dot excreted into the urine. The fat-soluble vitamins are more likely to be absorbed into the bloodstream and deposit in the fat and other tissues. In the cases of both water-soluble and fat-soluble vitamins, any vitamin not absorbed by the viscera is excreted in the feces. Megadoses of many of the vitamins produce diarrhea, because the non-absorbed nutrient draw water out of the body and into the gut, resulting in the loss of this water from the body.



Treatment In all cases, treatment of vitamin toxicity require discontinue vitamin supplements. Vitamin D toxicity requests complementary handling to reduce the calcium levels in the bloodstream because it can cause strangely high levels of plasma calcium (hypercalcemia). Severe hypercalcemia is a medical emergency and may be treated by infusing a medicine of 0.9% sodium chloride into the patient's bloodstream. The infusion consists of two to three liters of brackish water given over a period of one to two days.



Prognosis The prognosis for reverse vitamin toxicity is magnificent for most patients. Side effects usually abscond as presently as overdose are stopped. The exceptions are severe vitamin D toxicity, severe vitamin A toxicity, and severe vitamin B6 toxicity. Too much vitamin D lead to deposits of calcium salt in the tissue of the body, which cannot be reversed. Birth defects due to vitamin A toxicity cannot be reversed. Damage to the nervous system cause by megadoses of vitamin B6 can be reversed, but out-and-out reversal may compel a recovery period of over a year.



This technology will also allow scientists to find and identify far-reaching genes from other pathogens and bacteria, for illustration genes which may be commercially important in industrial process such as lavish handling, plastics fertility, trade, food processing or pharmaceutical fruition.




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