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:10/13/2017)... ... October 13, 2017 , ... While it’s often important to ... Fortunately, an inventor from Austin, Texas, has identified a solution. , She developed a ... or restricted lighting. As such, it eliminates the need to turn on a light ...
(Date:10/13/2017)... (PRWEB) , ... October 13, 2017 , ... PurhealthRX ... CBD Oil utilizing Purzorb™ technology. Applying the Purzorb™process to full spectrum CBD oil will ... and providing a CBD form that can be easily incorporated into liquid products, while ...
(Date:10/13/2017)... ... 2017 , ... Apple Rehab Shelton Lakes , which specializes in the ... facility as part of a disaster drill on October 3rd. , Apple Rehab participated ... Emergency Manager, as well as the Connecticut Long Term Care Mutual Aid Plan ...
(Date:10/13/2017)... NY (PRWEB) , ... October 13, 2017 , ... Ellevate ... people in business to advocate for action towards gender equality at their inaugural Summit ... from around the globe, and reached a social audience of over 3 million. To ...
(Date:10/13/2017)... , ... October 13, 2017 , ... ... be giving viewers the lowdown on sciatica in a new episode of "Success ... focuses on current events and innovation and investigates each subject in-depth with passion ...
Breaking Medicine News(10 mins):
(Date:9/28/2017)... Cohen Veterans Bioscience and Early Signal Foundation announce a ... sensors for real-time monitoring of patients with trauma-related and ... focused on disruptive health solutions for rare disorders and ... record and integrate behavioral, cognitive, physiological and contextual data. ... ...
(Date:9/23/2017)... 22, 2017 Janssen Biotech, Inc. (Janssen) announced ... from the U.S. Food and Drug Administration (FDA) for ... for the treatment of moderately to severely active rheumatoid ... data are needed to further evaluate the safety of ... RA. "We ...
(Date:9/18/2017)... Mich. , Sept. 18, 2017  PMD Healthcare ... Specialty Pharmacy of Kalamazoo, Mich. , ... hub service that expedites and streamlines patient and provider ... PD 2.0, and wellness management services.  ... device used to measure lung function for a variety ...
Breaking Medicine Technology: