How Caffeine Works

Health Benefits of Caffeine

Though caffeine can be useful, be mindful that it is a drug -- and be aware of how much fat and sugar your favorite forms of it contain.

Caffeine had long been on the list of don'ts for people hoping to lead a healthy lifestyle. Doctors pointed to caffeine's negative effects on the nervous system and its track record of increasing anxiety, stress and food cravings, as well as its damaging effects on sleep quality. Recent studies, however, suggest that coffee and caffeine may actually offer some significant medical benefits.

Remember the more than 19,000 studies mentioned earlier? Those studies have uncovered a range of positive effects that caffeine seems to have on the human body:


  • Regular coffee drinkers were 80 percent less likely to develop Parkinson's disease.
  • Two cups a day reduced subjects' risk for colon cancer by 20 percent.
  • Two cups a day caused an 80 percent drop in the odds of developing cirrhosis.
  • Two cups a day cut the risk of developing gallstones in half.

Studies have also suggested that caffeine is beneficial in treating asthma, stopping headaches, boosting mood and even preventing cavities [source: Kirchheimer].

Some of these findings may have something to do with other healthful properties of the coffee bean, but most can be linked to caffeine directly. Researchers are even developing drugs for Parkinson's disease containing caffeine derivatives.

More research is uncovering potential benefits from this commonly consumed drug. A study by the Byrd Alzheimer's Institute in Tampa, Fla., showed that lab mice injected with caffeine were protected against developing Alzheimer's disease. The injections even helped reduce symptoms in those that had the disease. The findings lead doctors to believe that up to five cups of coffee a day could have the same positive effect on humans [source: Arendash].

And a 2007 study at Rutgers University suggested that regular exercise combined with daily doses of caffeine could increase the destruction of precancerous skin cells in mice. Once again, the findings have not yet been tested on humans, but the indication is that it will have similar effects [source: Lu].

Despite these recent findings, most doctors still recommend moderation in regard to caffeine intake. These studies give hope to those who stand by the value of their morning cup of Joe, but there's still a long way to go to determine the long-term effects of caffeine use.

Related Articles

More Great Links


  • Arendash, G.W., et al. "Caffeine Protects Alzheimer's Mice Against Cognitive Impairment and Reduces Brain Beta-Amyloid Production," Neuroscience. Vol. 142. Page 941-52. 2006.
  • Center for Science in the Public Interest. "Caffeine Content of Food and Drugs." (Oct. 7, 2011)
  • Chudler, Eric. "Neuroscience for Kids: Caffeine." Oct. 1, 2011 (Oct. 2, 2011)
  • Dance, Rosalie A. and Sandefur, James T. "Reading This Could Help You Sleep: Caffeine in Your Body." Hands on Activities for Algebra at College. 1999. (Oct. 5, 2011)
  • Fredholm, B.B. "Notes on the history of caffeine use." Handbook of Experimental Pharmacology. Vol. 200. Pages 1-9. 2011.
  • Johns Hopkins University, Bayview Medical Center. "Caffeine Independence." (Oct. 5, 2011)
  • Johns Hopkins Medicine. "Caffeine withdrawal recognized as a disorder." Sept. 29, 2004 (Oct. 2, 2011)
  • Kirchheimer, Sid. "Coffee: The new health food?" January 26, 2004. (Oct. 5, 2011)
  • Kovacs, Betty. "Caffeine." 2011 (Oct 2, 2011)
  • Lu, Y.P., et al. "Voluntary exercise together with oral caffeine markedly stimulates UVB light-induced apoptosis and decreases tissue fat in SKH-1 mice." Proceedings of the National Academy of Sciences of the United States of America (PNAS). Vol. 104, no. 31. Page 12936-41. July 31, 2007. (Oct. 5, 2011)
  • Mayo Clinic Staff. "Caffeine: How much is too much?" March 9, 2011 (Oct. 2, 2011)
  • Wallace, Benjamin. "The World's Most Caffeinated Country." Bloomberg Businessweek. April 29, 2010 (Oct. 6, 2011)