Navigation Links
Yerkes researchers find link between psychological stress and overeating
Date:5/13/2008

ATLANTA--Researchers at the Yerkes National Primate Research Center, Emory University, have found socially subordinate female rhesus macaques over consume calorie-rich foods at a significantly higher level than do dominant females.

The study, which is available in the online edition of Physiology and Behavior, is a critical step in understanding the psychological basis for the sharp increase in obesity across all age groups since the mid-1970s. The study also is the first to show how food intake can be reliably and automatically measured, thus identifying the optimal animal model and setting for future obesity studies.

Because the relationship between diet, psychological stress and social and environmental factors is complex, Mark Wilson, PhD, chief of the Division of Psychobiology at Yerkes, and his research team set out to determine whether individuals chronically exposed to psychologically stressful environments over consume calorie-rich foods. To do this, they studied the feeding patterns of socially housed female rhesus macaques, which are organized by a dominance hierarchy that maintains group stability through continual harassment and threat of aggression. Such structure is a constant psychological stress to subordinates.

During the study, female macaques were given access to a sweet but low-fat diet and a high-fat diet for 21 days each. For a 21-day period between each test diet, the group was able to access standard monkey chow only. To track feeding patterns, automated feeders dispensed a pellet of either the low-fat or high-fat chow when activated by a microchip implanted in each female's wrist. Researchers found socially subordinate females consumed significantly more of both the low-fat diet and the high-fat diet throughout a 24-hour period, while socially dominant females ate significantly less than subordinate animals and restricted their feedings to daytime hours.

This difference in feeding behavior resulted in accelerated weight gain and an increase in fat-derived hormones in subordinate females. Dr. Wilson believes this may suggest profound changes in metabolism and the accumulation of body fat.

"Subordinates may be on a trajectory for metabolic problems. As this study shows, they prefer the high-fat diet and, as a result of the stress of being a subordinate, they have higher levels of the hormone cortisol. This may be involved in the redistribution of fat to visceral locations in the body, something that is clinically associated with type II diabetes metabolic syndrome," continued Dr. Wilson.

Using Yerkes' extensive neuroimaging capabilities, Dr. Wilson and his research team next will attempt to determine the neurochemical basis for why subordinate females overeat; specifically, whether appetite signals and brain areas associated with reward and satisfaction differ between subordinate and dominant females.


'/>"/>

Contact: Emily Rios
erios@emory.edu
404-727-7732
Emory University
Source:Eurekalert

Related medicine news :

1. Researchers who helped millions with arthritis receive prestigious Janssen Award
2. Carnegie Mellon engineering researchers automate analysis of protein patterns
3. Health researchers in McGill network receive $35.5 million in CIHR funding
4. Hopkins researchers discover new link to schizophrenia
5. Researchers find gene location that gives rise to neuroblastoma, an aggressive childhood cancer
6. Researchers Find Gene Location That Gives Rise to Neuroblastoma, an Aggressive Childhood Cancer
7. Researchers Publish Genome Sequence for Duck-Billed Platypus
8. UC San Diego researchers target tumors with tiny nanoworms
9. Researchers Find Lubricant Doesnt Hinder Fertility
10. MGH researchers report successful new laser treatment for vocal-cord cancer
11. Stanford researchers synthesize compound to flush HIV out of hiding
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/10/2016)... IN (PRWEB) , ... February 10, 2016 , ... ... benefits advisory organization, welcomes S.S. Nesbitt as the latest addition to its growing ... has seven other locations throughout the Southeast, from Orlando to Huntsville and in ...
(Date:2/10/2016)... ... ... Armune BioScience signed a definitive agreement with ARCpoint Labs ... the country. Launched in April of 2015, Apifiny is the only cancer specific, non-PSA ... volume exceeded 3,000 tests in 2015. Primary care physicians and urologists have utilized Apifiny ...
(Date:2/10/2016)... ... February 10, 2016 , ... For additional information contact ... , Pioneering book "Better with Age: The Ultimate Guide to Brain Training" by award-winning ... improve memory. The book’s publication date is March 16, 2016. A free review ...
(Date:2/10/2016)... ... February 10, 2016 , ... Everseat has joined the award-winning ... to physicians. The integration will enable Allscripts users to post open appointments to ... mobile app. , The partnership gives Everseat substantial added power to help Allscripts ...
(Date:2/10/2016)... ... ... Workrite Ergonomics this week announced the launch of the Conform Monitor Arm Series, ... was to develop a product from the ground up that would provide the most ... Hulsey, Product Manager for Workrite Ergonomics. “The Conform series features a wide variety ...
Breaking Medicine News(10 mins):
(Date:2/10/2016)... -- LexisNexis® Risk Solutions, a leading provider of data, ... LexisNexis Provider Performance Monitor , a clinical ... the quality and efficiency of provider networks through ... measuring provider performance through Provider Performance Monitor, payers ... improve the patient experience and reduce costs, as ...
(Date:2/10/2016)... SAN DIEGO , Feb. 10, 2016 ... biopharmaceutical company developing novel, clinical-stage therapies for sickle cell ... an underwritten public offering of 29,090,910 units at a ... unit consists of one share of the Company,s common ... the Company,s common stock at an exercise price of ...
(Date:2/10/2016)... ALSP, Inc. announced that it has appointed Col.(Retired) Dallas ... preparation for its move into clinical trials with its lead ... are pleased to welcome Dallas Hack onto the ... of such practical knowledge and far-reaching experience in Traumatic Brain ... broad experience and success as a clinician and researcher in ...
Breaking Medicine Technology: