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:12/7/2016)... ... December 07, 2016 , ... Augustine Insurance Agency, a ... and business owners in the greater Dallas metropolitan area, is announcing a charity ... Foundation. , Established in 2009 by active police professionals in the Dallas region, ...
(Date:12/7/2016)... ... ... A. Kevin Spann Insurance, a New York-based firm offering insurance and financial ... charity drive to raise funds that will benefit the Marine Corps League. , The ... FMF Corpsmen. Working closely with the MCL, the A. Kevin Spann team plans to ...
(Date:12/7/2016)... ... December 07, 2016 , ... The ... its fully redesigned website, which launched October 17, 2016, features comprehensive information regarding ... and easy-to-navigate layout. Visitors and patients can discover the latest clinical dermatology treatments ...
(Date:12/7/2016)... ... December 07, 2016 , ... ... Texas, is condemning "scam operations" carried out by unethical locksmith companies and is ... operations to a halt. According to Texas Premier Locksmith, these fraudulent locksmith services ...
(Date:12/7/2016)... (PRWEB) , ... December 07, 2016 , ... "ProBrand Flip ... and all media," said Christina Austin - CEO of Pixel Film Studios. , ProBrand ... easy to use drop zones. Editors can select from a variety of flip book ...
Breaking Medicine News(10 mins):
(Date:12/7/2016)... Corporate Whistleblower Center is urging a physician ... 866-714-6466 if they possess proof a pharmaceutical company is bribing doctors ... the innocent patients frequently being the victims, these types of schemes ... Medicare recipients or the elderly. Photo ... ...
(Date:12/7/2016)... , Dec. 7, 2016   Rx Savings Solutions ... and its Public Employees Insurance Agency (PEIA) to ... to their innovative healthcare software, ultimately saving money on their ... and provide its members with access to our software that ... more effective, affordable therapy can be found," says Michael ...
(Date:12/7/2016)... 2016  Varian Medical Systems (NYSE: VAR ... plans to separate its Imaging Components business.  The separation ... to Varian stockholders of common stock in Varex Imaging ... the Imaging Components business.  As part of the separation, ... end of January 2017, Varian will receive an approximate ...
Breaking Medicine Technology: