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Coffee And Your Health
Coffee and Your Health
Say it’s so, Joe: The potential health benefits -- and drawbacks –- of coffee.
By Neil Osterweil
WebMD Feature Reviewed by Jonathan L Gelfand, MD
Coffee may taste good and get you going in the morning, but what will it do for your health?
A growing body of research shows that coffee drinkers, compared to nondrinkers, are:
less likely to have type 2 diabetes, Parkinson's disease, and dementia
have fewer cases of certain cancers, heart rhythm problems, and strokes
“There is certainly much more good news than bad news, in terms of coffee and health,” says Frank Hu, MD, MPH, PhD, nutrition and epidemiology professor at the Harvard School of Public Health.
But (you knew there would be a “but,” didn’t you?) coffee isn't proven to prevent those conditions.
Researchers don't ask people to drink or skip coffee for the sake of science. Instead, they ask them about their coffee habits. Those studies can't show cause and effect. It's possible that coffee drinkers have other advantages, such as better diets, more exercise, or protective genes.
So there isn't solid proof. But there are signs of potential health perks -- and a few cautions.
If you're like the average American, who downed 416 8-ounce cups of coffee in 2009 (by the World Resources Institute's estimates), you might want to know what all that java is doing for you, or to you.
Here is a condition-by-condition look at the research.
Type 2 Diabetes
Hu calls the data on coffee and type 2 diabetes "pretty solid," based on more than 15 published studies.
"The vast majority of those studies have shown a benefit of coffee on the prevention of diabetes. And now there is also evidence that decaffeinated coffee may have the same benefit as regular coffee,” Hu tells WebMD.
In 2005, Hu's team reviewed nine studies on coffee and type 2 diabetes. Of more than 193,000 people, those who said they drank more than six or seven cups daily were 35% less likely to have type 2 diabetes than people who drank fewer than two cups daily. There was a smaller perk -- a 28% lower risk -- for people who drank 4-6 cups a day. The findings held regardless of sex, weight, or geographic location (U.S. or Europe).
More recently, Australian researchers looked at 18 studies of nearly 458,000 people. They found a 7% drop in the odds of having type 2 diabetes for every additional cup of coffee drunk daily. There were similar risk reductions for decaf coffee drinkers and tea drinkers. But the researchers cautioned that data from some of the smaller studies they reviewed may be less reliable. So it's possible that they overestimated the strength of the link between heavy coffee drinking and diabetes.
How might coffee keep diabetes at bay?
“It’s the whole package,” Hu says. He points to antioxidants -- nutrients that help prevent tissue damage caused by molecules called oxygen-free radicals. “We know that coffee has a very strong antioxidant capacity," Hu says.
Coffee also contains minerals such as magnesium and chromium, which help the body use the hormone insulin, which controls blood sugar (glucose). In type 2 diabetes, the body loses its ability to use insulin and regulate blood sugar effectively.
It's probably not the caffeine, though. Based on studies of decaf coffee, “I think we can safely say that the benefits are not likely to be due to caffeine," Hu says.
Hold the Caffeine?
The fact that coffee contains good stuff does not necessarily mean that it’s good for us, says James D. Lane, PhD, professor of medical psychology and behavioral medicine at Duke University Medical Center in Durham, N.C.
“It has not really been shown that coffee drinking leads to an increase in antioxidants in the body,” Lane tells WebMD. “We know that there are antioxidants in large quantities in coffee itself, especially when it’s freshly brewed, but we don’t know whether those antioxidants appear in the bloodstream and in the body when the person drinks it. Those studies have not been done.”
Regular coffee, of course, also contains caffeine. Caffeine can raise blood pressure, as well as blood levels of the fight-or-flight chemical epinephrine (also called adrenaline), Lane says.
Heart Disease and Stroke
Coffee may counter several risk factors for heart attack and stroke.
First, there's the potential effect on type 2 diabetes risk. Type 2 diabetes makes heart disease and stroke more likely.
Besides that, coffee has been linked to lower risks for heart rhythm disturbances (another heart attack and stroke risk factor) in men and women, and lower risk for strokes in women.
In a study of about 130,000 Kaiser Permanente health plan members, people who reported drinking 1-3 cups of coffee per day were 20% less likely to be hospitalized for abnormal heart rhythms (arrhythmias) than nondrinkers, regardless of other risk factors.
And, for women, coffee may mean a lower risk of stroke.
In 2009, a study of 83,700 nurses enrolled in the long-term Nurses' Health Study showed a 20% lower risk of stroke in those who reported drinking two or more cups of coffee daily compared to women who drank less coffee or none at all. That pattern held regardless of whether the women had high blood pressure, high cholesterol levels, and type 2 diabetes.
Parkinson’s and Alzheimer's Diseases
“For Parkinson’s disease, the data have always been very consistent: higher consumption of coffee is associated with decreased risk of Parkinson’s,” Hu tells WebMD. That seems to be due to caffeine, though exactly how that works isn't clear, Hu notes.
Coffee has also been linked to lower risk of dementia, including Alzheimer’s disease. A 2009 study from Finland and Sweden showed that, out of 1,400 people followed for about 20 years, those who reported drinking 3-5 cups of coffee daily were 65% less likely to develop dementia and Alzheimer’s disease, compared with nondrinkers or occasional coffee drinkers.
Cancer
The evidence of a cancer protection effect of coffee is weaker than that for type 2 diabetes. But “for liver cancer, I think that the data are very consistent,” Hu says.
“All of the studies have shown that high coffee consumption is associated with decreased risk of liver cirrhosis and liver cancer,” he says. That's a "very interesting finding," Hu says, but again, it's not clear how it might work.
Again, this research shows a possible association, but like most studies on coffee and health, does not show cause and effect.
Pregnancy
In August 2010, the American College of Obstetricians and Gynecologists (ACOG) stated that moderate caffeine drinking -- less than 200 mg per day, or about the amount in 12 ounces of coffee -- doesn't appear to have any major effects on causing miscarriage, premature delivery, or fetal growth.
But the effects of larger caffeine doses are unknown, and other research shows that pregnant women who drink many cups of coffee daily may be at greater risk for miscarriage than non-drinkers or moderate drinkers. Again, it's not clear whether the coffee was responsible for that.
Calories, Heartburn, and Urine
You won't break your calorie budget on coffee -- until you start adding the trimmings.
According to the web site myfoodapedia.gov -- part of the U.S. Department of Agriculture's Center for Nutrition Policy and Promotion -- a 6-ounce cup of black coffee contains just 7 calories. Add some half & half and you'll get 46 calories. If you favor a liquid nondairy creamer, that will set you back 48 calories. A teaspoon of sugar will add about 23 calories.
Drink a lot of coffee and you may head to the bathroom more often. Caffeine is a mild diuretic -- that is, it makes you urinate more than you would without it. Decaffeinated coffee has about the same effect on urine production as water.
Both regular and decaffeinated coffee contain acids that can make heartburn worse.
History Of Coffee
The history of coffee goes at least as far back as the thirteenth century. It has been believed that Ethiopian ancestors of today's Oromo people were the first to discover and recognize the energizing effect of the coffee bean plant.[1] The story of Kaldi, the 9th-century Ethiopian goatherd who discovered coffee, did not appear in writing until 1671 AD and is probably apocryphal.[2] From Ethiopia, coffee was said to have spread to Egypt and Yemen.[3] The earliest credible evidence of either coffee drinking or knowledge of the coffee tree appears in the middle of the fifteenth century, in the Sufi monasteries of Yemen.[1] By the 16th century, it had reached the rest of the Middle East, Persia, Turkey, and northern Africa. Coffee then spread to Italy, and to the rest of Europe, to Indonesia, and to the Americas.[4]
First uses
There are several legendary accounts of the origin of the drink itself. One account involves the Yemenite Sufi mystic Ghothul Akbar Nooruddin Abu al-Hasan al-Shadhili.[6] When traveling in Ethiopia, the legend goes, he observed birds of unusual vitality, and, upon trying the berries that the birds had been eating, experienced the same vitality.
Other accounts attribute the discovery of coffee to Sheik Abou'l Hasan Schadheli's disciple, Omar. According to the ancient chronicle (preserved in the Abd-Al-Kadir manuscript), Omar, who was known for his ability to cure the sick through prayer, was once exiled from Mocha to a desert cave near Ousab. Starving, Omar chewed berries from nearby shrubery, but found them to be bitter. He tried roasting the beans to improve the flavor, but they became hard. He then tried boiling them to soften the bean, which resulted in a fragrant brown liquid. Upon drinking the liquid Omar was revitalized and sustained for days. As stories of this "miracle drug" reached Mocha, Omar was asked to return and was made a saint. [7]
Another story involves a goat-herd, Kaldi, who, noticing the energizing effects when his flock nibbled on the bright red berries of a certain bush, chewed on the fruit himself. His exhilaration prompted him to bring the berries to a Muslim holy man in a nearby monastery. But the holy man disapproved of their use and threw them into the fire, from which an enticing aroma billowed and the holy men came. The roasted beans were quickly raked from the embers, ground up, and dissolved in hot water, yielding the world's first cup of coffee. The Ethiopian ancestors of today's Oromo tribe, were the first to have recognized the energizing effect of the native coffee plant.[2] Studies of genetic diversity have been performed on Coffea arabica varieties, found to be of low diversity but which retained some residual heterozygosity from ancestral materials, and closely related diploid species Coffea canephora and C. liberica;[8] however, no direct evidence has ever been found indicating where in Africa coffee grew or who among the natives might have used it as a stimulant, or known about it there earlier than the seventeenth century.[2]
COFFEE INFO
Coffee is a brewed beverage with a dark, acidic flavor prepared from the roasted seeds of the coffee plant, colloquially called coffee beans. The beans are found in coffee cherries, which grow on trees cultivated in over 70 countries, primarily in equatorial Latin America, Southeast Asia, South Asia and Africa. Green (unroasted) coffee is one of the most traded agricultural commodities in the world.[1] Coffee can have a stimulating effect on humans due to its caffeine content. It is one of the most-consumed beverages in the world.[2]
Coffee has played a crucial role in many societies. The energizing effect of the coffee bean plant is thought to have been discovered in the northeast region of Ethiopia, and the cultivation of coffee first expanded in the Arab world.[3] The earliest credible evidence of coffee drinking appears in the middle of the 15th century, in the Sufi shrines of Yemen in southern Arabia.[3] From the Muslim world, coffee spread to India,[4] Italy, then to the rest of Europe, to Indonesia, and to the Americas.[5] In East Africa and Yemen, it was used in religious ceremonies. As a result, the Ethiopian Church banned its secular consumption, a ban in effect until the reign of Emperor Menelik II of Ethiopia.[6] It was banned in Ottoman Turkey during the 17th century for political reasons,[7] and was associated with rebellious political activities in Europe.
Coffee berries, which contain the coffee seeds or "beans", are produced by several species of small evergreen bush of the genus Coffea. The two most commonly grown are the highly regarded Coffea arabica, and the 'robusta' form of the hardier Coffea canephora. The latter is resistant to the devastating coffee leaf rust (Hemileia vastatrix). Once ripe, coffee berries are picked, processed, and dried. The seeds are then roasted to varying degrees, depending on the desired flavor. They are then ground and brewed to create coffee. Coffee can be prepared and presented in a variety of ways.
An important export commodity, coffee was the top agricultural export for twelve countries in 2004,[8] and it was the world's seventh-largest legal agricultural export by value in 2005.[9] Some controversy is associated with coffee cultivation and its impact on the environment. Many studies have examined the relationship between coffee consumption and certain health conditions; whether the overall effects of coffee are ultimately positive or negative has been widely disputed.[10] The method of brewing coffee has been found to be important to its health effects.[11]
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