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:6/27/2016)... ... June 27, 2016 , ... ... health professionals, announced today its affiliation with Tennessee Counseling Association. This ... the network of the Tennessee Counseling Association, adding exclusive benefits and promotional offers. ...
(Date:6/26/2016)... ... 2016 , ... On June 10-11, 2016, A Forever Recovery, a holistic treatment ... Longest Breakfast Table in Battle Creek, MI, where the rehabilitation facility is located. This ... of the world’s leading providers of cereal and other breakfast foods. Its residents often ...
(Date:6/25/2016)... ... 2016 , ... Experts from the American Institutes for Research ... June 26-28, 2016, at the Hynes Convention Center in Boston. , AIR experts ... planning, healthcare costs and patient and family engagement. , AIR researchers will be ...
(Date:6/25/2016)... ... June 25, 2016 , ... As a lifelong Southern Californian, ... and his M.D from the David Geffen School of Medicine at UCLA. He trained ... Angeles to complete his fellowship in hematology/oncology at the UCLA-Olive View-Cedars Sinai program where ...
(Date:6/24/2016)... ... 2016 , ... Those who have experienced traumatic events may suffer from a ... such as drug or alcohol abuse, as a coping mechanism. To avoid this pain ... following a traumatic event. , Trauma sufferers tend to feel a range of emotions, ...
Breaking Medicine News(10 mins):
(Date:6/26/2016)... 26, 2016 One of Australia,s ... formation of a new biotechnology company, Noxopharm Limited [ABN 50 608 ... IPO and to list on the ASX. Noxopharm is ... to enter a Phase 1 clinical study later this year. ... one of the biggest problems facing cancer patients - the ability ...
(Date:6/26/2016)... June 27, 2016 Jazz Pharmaceuticals plc (Nasdaq: ... under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as ... Celator Pharmaceuticals, Inc. ("Celator"; Nasdaq: CPXX ) ... Daylight Time). As previously announced on May ... definitive merger agreement under which Jazz Pharmaceuticals has commenced ...
(Date:6/26/2016)... -- VMS Rehab Systems, Inc. ( www.vmsrehabsystemsinc.com ) reported today ... to build a strong and stable market for trading ... the OTC Markets-pink current trading platform. Explains ... seeing an anomaly in market trading activities that may ... Company, but shareholders and market players as well. I ...
Breaking Medicine Technology: