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3

Mar

NIH Study shows caffeine consumption linked to estrogen changes

Posted by steph 

Because endometriosis is known to thrive on estrogen, I thought it prudent to post this research article.

NIH Study shows caffeine consumption linked to estrogen changes
Thursday, January 26, 2012
Contact:
Robert Bock or John McGrath

Moderate caffeine intake associated with higher level for Asians, lower for whites
Asian women who consumed an average of 200 milligrams or more of caffeine a day — the equivalent of roughly two cups of coffee — had elevated estrogen levels when compared to women who consumed less, according to a study of reproductive age women by researchers at the National Institutes of Health and other institutions.

However, white women who consumed 200 milligrams or more of caffeine a day had slightly lower estrogen levels than women who consumed less. Black women who consumed 200 milligrams or more of caffeine a day were found to have elevated estrogen levels, but this result was not statistically significant.

Total caffeine intake was calculated from any of the following sources: coffee, black tea, green tea, and caffeinated soda.

Findings differed slightly when the source of caffeine was considered singly. Consuming 200 milligrams or more of caffeine from coffee mirrored the findings for overall caffeine consumption, with Asians having elevated estrogen levels, whites having lower estrogen levels, and the results for blacks not statistically significant. However, consumption of more than one cup each day of caffeinated soda or green tea was associated with a higher estrogen level in Asians, whites, and blacks.

The changes in estrogen levels among the women who took part in the study did not appear to affect ovulation. Studies conducted in animals had suggested that caffeine might interfere with ovulation.

The study was published online in the American Journal of Clinical Nutrition.

“The results indicate that caffeine consumption among women of child-bearing age influences estrogen levels,” said Enrique Schisterman, Ph.D., of the Division of Epidemiology, Statistics and Prevention Research at the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), the NIH institute where some of the research was conducted. “Short term, these variations in estrogen levels among different groups do not appear to have any pronounced effects. We know that variations in estrogen level are associated with such disorders as endometriosis, osteoporosis, and endometrial, breast, and ovarian cancers. Because long term caffeine consumption has the potential to influence estrogen levels over a long period of time, it makes sense to take caffeine consumption into account when designing studies to understand these disorders.”

The study authors noted that 89 percent of U.S. women from 18-34 years of age consume the caffeine equivalent of 1.5 to two cups of coffee a day.

The study’s first author was Karen C. Schliep, Ph. D., M.S.P.H., from the University of Utah, Salt Lake City, who conducted the study during a research appointment at NICHD. Dr. Schliep undertook the research with Dr. Schisterman and colleagues at the University of Utah, the NICHD and the State University of New York at Buffalo.

More than 250 women from 18 to 44 years old participated in the study between 2005 and 2007. On average, they consumed 90 milligrams of caffeine a day, approximately equivalent to one cup of caffeinated coffee.

Most of the participants in the study reported to the study clinic one to three times a week for two menstrual cycles. Their visits were scheduled to correspond with specific stages of the menstrual cycle. At the visits, the women reported what they had eaten in the last 24 hours and answered questions about their exercise, sleep, smoking and other aspects of their lifestyle and reproductive hormone levels were measured in blood. The study authors noted that collection of these details during multiple time points across two menstrual cycles produced more precise information about the link between caffeine and hormones than was possible in earlier studies. The researchers also noted that the study participants were more racially diverse than those who took part in previous studies.

About the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD): The NICHD sponsors research on development, before and after birth; maternal, child, and family health; reproductive biology and population issues; and medical rehabilitation. For more information, visit the Institute’s website at http://www.nichd.nih.gov/.

About the National Institutes of Health (NIH): NIH, the nation’s medical research agency, includes 27 Institutes and Centers and is a component of the U.S. Department of Health and Human Services. NIH is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases. For more information about NIH and its programs, visit www.nih.gov.

Published in Biology, diet, Research

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Mankoski Pain Scale

0 - Pain Free

1 - Very minor annoyance - occasional
minor twinges. No medication needed.

2 - Minor Annoyance - occasional
strong twinges.
No medication needed.

3 - Annoying enough to be distracting.
Mild painkillers take care of it.
(Aspirin, Ibuprofen.)

4 - Can be ignored if you are really
involved in your work, but still
distracting. Mild painkillers remove
pain for 3-4 hours.

5 - Can't be ignored for more than 30
minutes. Mild painkillers ameliorate
pain for 3-4 hours.

6 - Can't be ignored for any length of
time, but you can still go to work and
participate in social activities.
Stronger painkillers (Codeine,
narcotics) reduce pain for 3-4 hours.

7 - Makes it difficult to concentrate,
interferes with sleep. You can still
function with effort. Stronger
painkillers are only partially effective.

8 - Physical activity severely limited.
You can read and converse with effort.
Nausea and dizziness set in as factors
of pain.

9 - Unable to speak. Crying out or
moaning uncontrollably - near delirium.

10 - Unconscious. Pain makes you
pass out.

© Andrea Mankoski

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