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Not all of caffeine is completely removed with any of these current methods. To qualify as decaffeinated coffee in United States, coffee must have at least 97 percent of its caffeine removed.
Coffee beans are decaffeinated before they are roasted because that's when it has least effect on beans flavor.
The reason decaffeinated coffee costs more is because of additional labor, equipment and material needed to remove caffeine.
So what do they do with all of that caffeine? The extracted caffeine is manufactured and used mostly in medicines and soft drinks.
As an example, caffeine content in soft drinks mainly comes from caffeine extracted from these decaffeination processes. The kola nut accounts for less than 5 percent of caffeine in cola drinks.
For past 30 years scientists have done extensive research on coffee and effects of caffeine. New research has even shown that caffeine has many positive effects.
Some of these effects include more energy, ability to concentrate better and has even been used as an appetite suppressant.
But not all scientists agree with these findings and coffee and effects of caffeine will continue to be thoroughly researched.
There will always be a market for decaffeinated coffee because some people just love their coffee without caffeine buzz.
The rest of 100 million regular coffee drinkers either love their coffee for wonderful flavor or enjoy effects of a caffeine boost. For most of us, I'm sure it's a little of both.
Gary Gresham is the webmaster for http://www.perfectcoffees.com where you can purchase quality coffee, tea, cups & mugs, coffee gifts and delicious desserts online. He offers a free monthly coffee newsletter with articles like these at http://www.perfectcoffees.com/newsletter.html