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Caffeinated coffee linked to less depression; 50,000-woman study

  [ 18 votes ]   [ 2 Comments ]
www.ProHealth.com • September 28, 2011


The risk of depression appears to decrease for women with increasing consumption of caffeinated coffee, according to a report in the Sep 26 issue of the American Medical Association’s Archives of Internal Medicine.(1)

Caffeine is the most frequently used central nervous system stimulant in the world, and approximately 80% of consumption is in the form of coffee, according to background information in the article.

Previous research, including one prospective study among men, has suggested an association between coffee consumption and depression risk. [A large study of Finnish men  found a 77% reduction in depression risk among heavy coffee drinkers vs non-drinkers; little difference for those consuming caffeine in tea.]

Because depression is a chronic and recurrent condition that affects twice as many women as men, including approximately one of every five U.S. women during their lifetime, “identification of risk factors for depression among women and the development of new preventive strategies are, therefore, a public health priority,” write the authors.

They sought to examine whether, in women, consumption of caffeine or certain caffeinated beverages is associated with the risk of depression.

Nutrition researcher Michel Lucas, PhD, RD,  and colleagues at the Harvard School of Public Health, Boston, studied 50,739 U.S. women who participated in the Nurses’ Health Study.

Participants, who had a mean (average) age of 63, had no depression at the start of the study in 1996, and were prospectively followed up with through June 2006.

Researchers measured caffeine consumption through questionnaires completed from May 1980 through April 2004, including the frequency that caffeinated and noncaffeinated coffee, nonherbal tea, caffeinated soft drinks (sugared or low-calorie colas), caffeine-free soft drinks (sugared or low-calorie caffeine-free colas or other carbonated beverages) and chocolate were usually consumed in the previous 12 months.

The authors defined depression as reporting a new diagnosis of clinical depression and beginning regular use of antidepressants in the previous two years.

Analysis of the cumulative mean consumption included a two-year latency period; for example, data on caffeine consumption from 1980 through 1994 were used to predict episodes of clinical depression from 1996 through 1998; consumption from 1980 through 1998 were used for the 1998 through 2000 follow-up period; and so on.

During the 10-year follow-up period from 1996 to 2006, researchers identified 2,607 incident (new-onset) cases of depression.

• When compared with women who consumed one cup of caffeinated coffee or less per week, those who consumed two to three cups per day had a 15% decrease in relative risk for depression,

• And those consuming four cups or more per day had a 20% decrease in relative risk.

• Compared with women in the lowest (less than 100 milligrams [mg] per day) categories of caffeine consumption, those in the highest category (550 mg per day or more) had a 20% decrease in relative risk of depression.

• No association was found between intake of decaffeinated coffee and depression risk.

“In this large prospective cohort of older women free of clinical depression or severe depressive symptoms at baseline, risk of depression decreased in a dose-dependent manner with increasing consumption of caffeinated coffee,” write the authors.

They note that this observational study “cannot prove that caffeine or caffeinated coffee reduces the risk of depression but only suggests the possibility of such a protective effect.”

The authors call for further investigations to confirm their results and to determine whether usual caffeinated coffee consumption could contribute to prevention or treatment of depression.

[Note: We also wonder whether some people who avoid coffee because it disrupts their sleep and/or stimulates anxiety might also be more susceptible to depression.]

_____

1. Article: "Coffee, Caffeine, and Risk of Depression Among Women."

Source: Archives of Internal Medicine News Release, Sep 27, 2011




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Article Comments Post a Comment

Study abstainers
Posted by: IanH
Oct 4, 2011
They need to study abstainers such as Mormons and other religious groups and compare them to coffee drinkers. Wow! talk about confounding variables. This study has a long way to go before any conclusions about caffeine and depression. To start with, how is the "depression" diagnosed?
Reply Reply

How is this a depression study?
Posted by: TwoCatDoctors
Oct 20, 2011
How is this a depression study when the participants didn't have depression to start with?
Reply Reply
 
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