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Facts about caffeine |
| Date Added: July 14, 2010 07:14:12 AM |
| Author: Tom Donne |
| Category: |
| Facts about : caffein. Caffeine is the world's most popular drug. The white, bitter-tasting, crystalline substance was firstly sequestered from coffee in 1820. Both words, caffeine and coffee, are descended from the Arabic word qahweh. The rootages of the words reflect the spread of the drink into Europe via Arabia and Turkey from north-east Africa, where coffee trees were cultivated in the 6th century. Coffee began to be popular in Europe in the 17th century. By the 18th century woodlets had been established in Indonesia and the The Indies. The caffeine content of coffee beans alters according to the species of the coffee plant. Beans from Coffee arabica, grown mostly in Central and South America, contain about 1.1 % caffeine. Beans from Coffee robusta, grown mostly in Indonesia and Africa, carry about 2.2 % caffeine. Caffeine is also got in tea. It was first isolated from tea leaves in 1827 and called "theine" because it was believed to be a distinctly different compound from the caffeine in coffee. Tea leaves hold about 3.5 % caffeine, but a cup of tea usually contains less caffeine than a cup of coffee because practically less tea than coffee is used during preparation. Short run Effects. Caffeine taken in beverage form begins to reach all tissues of the body within five mins. Extremum blood levels are attained in about 30 minutes. One half of a given dose of caffeine is metabolised in about four hours more rapidly in smokers and less rapidly in newborn infants, in women in late pregnancy, and in sufferers from liver disease. Ordinarily, almost all ingested caffein is metabolised. To a lesser extent than 3 % seems unchanged in urine, and there is no day by day aggregation of the drug in the body. Short run effects of a drug are those that come out after a single dosage and go away within hours. Consumption of the quantity of caffeine in one or two cups of coffee (75-150 mg) causes many modest physiological outcomes. General metabolism increases - expressed as an increase in action or raised temperature, or both. The rate of breathing increases, as does micturition and the levels of fatty acids in the blood and of gastric juice in the abdomen. Caffein use may increase blood pressure. Caffeine excites the brain and behavior. Use of 75-150 mg of caffeine lifts neural activeness in many parts of the brain, postpones fatigue, and heightens performance at unproblematic intellectual tasks and at physical work that implies endurance but not fine motor coordination. Caffeine's effects on complex intellectual tasks and on mood do not lend themselves to a simple summary. The effects depend on the personality of the user, on the immediate environment, on the user's knowing whether caffeine has been taken, and even on the time of day. The effects of caffeine on sleep are clear cut : taken before bedtime, it usually holds up sleep onset, shortens overall sleep time, and reduces the "depth" of sleep. After using caffeine, sleepers are more easily aroused, move more during sleep, and report a reduction in the quality of sleep. The effects of caffeine on dreaming are less clear. Big doses of caffeine, specially when given to non-users, can produce cephalalgia, nervousness, abnormally speedy heartbeat (tachycardia), convulsions, and even craze. Near-fatal dosages cause a crisis resembling the state of a diabetic without insulin, including high levels of blood sugar and the appearance of acetone-like substances in urine. The lowest known dose fatal to an adult has been 3,200 mg - administered intravenously by chance event. The fatal oral dose is in excess of 5,000 mg - the equivalent of 40 potent cups of coffee taken in a very short space of time. Long term Effects. Long term effects of a toxic nature do not seem evident when regular caffeine use is below about 650 mg a day - tantamount to about eight or nine average cups of coffee. Above this level, users may suffer from chronic insomnia, persistent anxiety and depressive disorder, and stomach ulcers. Caffeine use looks to be tied in with atypical heartbeat and may raise cholesterol levels, but there is no strong evidence that caffeine causes cardiopathy. Caffeine certainly has the ability to do a variety of generative effects in animals, including congenital abnormalities and reproductive failures, reduced fertility, prematurity, and low birth weight. What is unknown is whether these findings are relevant to the use of ordinary amounts of caffeine-containing drinks by pregnant women. Pregnant women have been advised to restrict caffeine consumption by both Canadian and United States governments. Pregnant smokers should be especially wary. You can get a great more information in that website: Mens health Tom Donne is a seo enthusiast. Loves to learn new computer languages. He has a website about health - Mens health |
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