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:5/27/2016)... ... May 27, 2016 , ... More than a third of American adults are ... bariatric surgery has received increased attention in recent years, as an article ... to weight loss, most people are familiar with the basic requirements of maintaining a ...
(Date:5/27/2016)... ... , ... W.S. Badger Co. Inc ., the maker of certified organic ... one of the best small businesses for new dads by Fatherly, the digital lifestyle ... providing progressive benefits to new parents on the organization’s 2016 Best Places to ...
(Date:5/27/2016)... ... May 27, 2016 , ... This campaign aims to provide a ... as a society can control and change. , As nearly 795,000 Americans suffering from ... within the United States. Plus, with an estimated 129,000 of these people dying from ...
(Date:5/27/2016)... Killeen, Texas (PRWEB) , ... May 27, 2016 , ... ... with satisfying Army body fat composition regulations. This is the first time that ... are normally screened at least every six months to ensure they meet the prescribed ...
(Date:5/27/2016)... , ... May 27, 2016 , ... ... scholarships to students studying complementary medicine. Allison Outerbridge is this year’s Life ... award on May 18 at the university’s Student Leadership Awards ceremony. , Outerbridge ...
Breaking Medicine News(10 mins):
(Date:5/27/2016)... Amarantus BioScience Holdings, Inc. ... Regenerative Medicine, Neurology and Orphan Diseases, today announced that President & ... upcoming investor conferences: SeeThru Equity MicroCap Conference   ... New York City , NY When: Tuesday, May ... Conference   Where: Grand Hyatt Hotel, 109 East 42 ...
(Date:5/26/2016)... May 26, 2016   Change Healthcare ... analytics, network solutions and technology-enabled services designed ... entered into a strategic channel partnership with ... software solutions and revenue cycle management services ... and rehabilitation clinics to optimize revenue, operational ...
(Date:5/25/2016)... HILDEN , Germany and ... QIAGEN N.V. (NASDAQ: QGEN ; Frankfurt ... into a licensing and co-development agreement with Therawis Diagnostics GmbH ... project will be to develop and market PITX2 as a ... and other high-risk breast cancer patients. "We are ...
Breaking Medicine Technology: