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Recommend ScienceDaily: Scientists Highlight Link Between Stress and Appetite (Email)

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http://www.sciencedaily.com/releases/2011/08/110812213034.htm

ScienceDaily (Aug. 13, 2011) — Researchers in the Hotchkiss Brain Institute (HBI) at the University of Calgary's Faculty of Medicine have uncovered a mechanism by which stress increases food drive in rats. This new discovery, published online this week in the journal Neuron, could provide important insight into why stress is thought to be one of the underlying contributors to obesity.

Normally, the brain produces neurotransmitters (chemicals responsible for how cells communicate in the brain) called endocannabinoids that send signals to control appetite. In this study, the researchers found that when food is not present, a stress response occurs that temporarily causes a functional re-wiring in the brain. This re-wiring may impair the endocannabinoids' ability to regulate food intake and could contribute to enhanced food drive.

The researchers also discovered that when they blocked the effects of stress hormones in the brain, the absence of food caused no change in the neural circuitry.


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