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The Science of Coffee
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Caffeine is found in other drinks besides coffee. The following table shows the amount of caffeine typically found in a variety of drinks:
| Type of Drink | Typical | Range |
| COFFEE (150ml cup) | ||
| Brewed, Drip Method | 115 | 60 - 180 |
| Brewed, Percolator | 80 | 40 - 170 |
| Instant | 65 | 30 - 120 |
| De-caffeinated | 3 | 2 - 5 |
| Espresso (30ml cup) | 40 | 30 - 50 |
| TEAS (150ml cup) | ||
| Brewed, Major Brands | 40 | 20 - 90 |
| Instant | 30 | 25 - 50 |
| Iced (240ml glass) | 45 | 45 - 50 |
| OTHERS | ||
| Cola Soft Drink (180ml) | 18 | 15 - 30 |
| Cocoa Beverage (150ml) | 4 | 2 - 20 |
| Chocolate Milk Drink (240ml) | 5 | 2 - 7 |
| Milk Chocolate (30 grams) | 6 | 1 - 15 |
| Dark Chocolate - Semi Sweet (30g) | 20 | 5 - 35 |
| Cooking Chocolate (30 grams) | 26 | 26 |
| Source: IFIC, International Food Information Council | ||
SLIDESHOW:
Coffee as Beverage
©Mark Prince The average daily intake of caffeine for people living in America or
the United Kingdom is 200 to 300 mg of coffee caffeine a day. This would
be the equivalent of 2 cups of coffee, a can of cola and a chocolate bar.
Of course, some people consume much more caffeine than the average, and others consume very little. The chart above will allow you to figure out your own daily caffeine intake.
The effect of caffeine on the human body is a much disputed scientific topic. There are many studies showing that caffeine has negative physiological effects such as raising blood pressure, elevating stress levels, and harming blood vessels. Caffeine can also remove calcium from the bones and cause fertility problems in women.
On the other hand, caffeine has been shown to reduce your chances of getting colon cancer and Parkinson's disease. Studies conducted in Australia and South Carolina indicate that can caffeine can increase athletic performance. Caffeine has also shown to be effective in weight-loss programs.
There have been more than 17,000 scientific papers published about caffeine, many of them directly contradicting each other. While it is clear that some groups of people (such as pregnant women) should restrict their caffeine intake, most people are probably safe in consuming a couple of coffees a day.
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Bibliography
Printed matters:
Coffee: A Guide to Buying, Brewing, and Enjoying by Kenneth Davids
Coffee Basics: A Quick and Easy Guide by Kevin Knox and Julie Sheldon Huffaker
Clifford M.N. and Willson K.C. (Editors) - Coffee; botany, biochemistry and production of beans and beverage. London, Croom Helm, 1985
Wrigley G. - Coffee. London, Longman, 1988
Anacafe. 1995. Hombres de Cafe. Guatemala: Talleres de Litografia Galton.
Coffee, a Medicinal Plant: All About Coffee and Its Effects on Human Health by Darcy R. Lima
Davids, K. 1991. Coffee: A Guide to Buying, Brewing and Enjoying. Santa Rosa: 101 Productions.
Davids, K. 1996. Home Coffee Roasting: Romance and Revival. New York: St. Martin's Griffin.
Illy, A. and Viani, R. 1995. Espresso Coffee: The Chemistry of Quality. San Diego: Academic P.
Illy, F. and Illy, R. 1989. Dal Caffe al Espresso. Milano: A. Mondadoni.
Websites:
Decaf Coffee Plants Developed
http://www.sciam.com/article.cfm?articleID=
000EBC70-B434-1EF0-A6B8809EC588EEDF
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