Navigation Links
Having Twin Sister Boosts Men's Anorexia Risk
Date:12/3/2007

Shared fetal environment may be to blame, researchers say

MONDAY, Dec. 3 (HealthDay News) -- Males with a twin sister are more likely than other males to develop the eating disorder anorexia nervosa, scientists say.

The finding supports the theory that exposure to female sex hormones in the womb may be associated with increased risk for anorexia nervosa, note British and Canadian researchers.

"Anorexia nervosa is approximately 10 times more common in females than in males. The reasons for this difference is not known, and it is likely that their unraveling will represent an important step forward in the understanding of the etiopathogenetic factors involved in the development of eating disorders," Marco Procopio, of the University of Sussex in England, and Paul Marriott, of the University of Waterloo in Canada, wrote as background information in their study.

They analyzed data from a study of Swedish twins born between 1935 and 1958 and found that, overall, female twins were more likely than male twins to develop anorexia nervosa.

The exception was among males with a fraternal (dizygotic) twin sister. The risk level of these males was not statistically different than that of females from such a twin pair.

Among 4,478 fraternal opposite-sex twins, 20 females and 16 males had anorexia nervosa as defined by narrow criteria, and 32 females and 27 males had anorexia nervosa as defined by broader criteria.

"A plausible explanation for this phenomenon is that in pregnancies bearing a female fetus, a substance is produced, probably hormonal, that increases the risk of having anorexia nervosa in adulthood," the study authors wrote. "Because the male half of an opposite-sex twin pair would also be exposed to this substance, it could account for the observed elevated risk in males with female twins. The most likely candidates are sex steroid hormones."

The study appears in the December issue of the Archives of General Psychiatry.

More information

The American Academy of Family Physicians has more about anorexia nervosa.



-- Robert Preidt



SOURCE: JAMA/Archives journals, news release, Dec. 3, 2007


'/>"/>
Copyright©2007 ScoutNews,LLC.
All rights reserved

Related medicine news :

1. Researchers estimate about 9 percent of US children age 8 to 15 meet criteria for having ADHD
2. More reports of children having trouble falling asleep than maintaining sleep
3. Overweight mothers run greater risk of having hyperactive children
4. New Survey Finds that over Half of MRSA Patients Report Having Received No Information about the Disease from Health Care Providers
5. Having Lots of Kids Helps Dads Live to 100
6. Nine Questions to Help You Protect Your Heart Before Having Surgery
7. College Mental Health Expert and Sister of Student Who Died By Suicide Available to Discuss College Mental Health Issues
8. The Sisters of Charity Health System Awards Four Nursing Scholarships in Ohio and South Carolina
9. Terrell Herring Honored by Big Brothers Big Sisters
10. Sister Red Cross Societies Help Each Other
11. New treatment boosts muscle function in myasthenia gravis
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/9/2016)... (PRWEB) , ... February 09, 2016 , ... ... Boston Store, Carson’s, Elder-Beerman, Herberger’s and Younkers department stores, announced it has raised ... of Wisconsin Cancer Center, Holden Comprehensive Cancer Center at the University of Iowa, ...
(Date:2/9/2016)... San Diego, California (PRWEB) , ... February 09, ... ... the launch of their new nationwide service to expand access to affordable ... over 30 million hard of hearing individuals in the United States. , “For ...
(Date:2/9/2016)... Florida (PRWEB) , ... February 09, 2016 , ... ... cold therapy products, announced today the introduction of the newly designed, innovative shoulder ... comfort and better cold therapy coverage for the injured arm and shoulder to ...
(Date:2/9/2016)... ... 09, 2016 , ... United Methodist Communications collaborated with Chocolate ... animated video designed to prevent the next widespread Ebola outbreak from ... being distributed throughout Togo, Liberia, Sierra Leone, Nigeria, Côte d’Ivoire and other African ...
(Date:2/9/2016)... ... February 09, 2016 , ... i2i Systems, an early innovator and ... data vendors in the latest KLAS report, Population Health Management 2015: How Far Can ... market for population health management (PHM). The latest KLAS Report, leveraging over 200 ...
Breaking Medicine News(10 mins):
(Date:2/9/2016)... Feb. 9, 2016  Sangamo BioSciences, Inc. (NASDAQ: ... editing, today reported its fourth quarter and full ... in vivo therapeutic genome editing," said Edward ... zinc finger nuclease (ZFN) technology leads the therapeutic ... core competencies necessary to move our ground-breaking genome ...
(Date:2/9/2016)... HAMILTON, Bermuda, Feb. 9, 2016  Axovant Sciences ... focused on the treatment of dementia, today announced ... address cognitive, behavioral and functional aspects of Lewy ... people in the U.S. Two out of the ... is expected to start later this quarter. In ...
(Date:2/9/2016)... The new report "Global Diagnostic Ultrasound Devices Market Assessment & Forecast: ... global diagnostic ultrasound devices market was valued at US$ 5,381.1 million ... 2019 at a CAGR of 6.8% from 2015 to 2019. ... analyzed for six geographies of North America , ... Latin America , Middle-East and ...
Breaking Medicine Technology: