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J Physiol Volume 583, Number 2, 431-436, September 1, 2007 DOI: 10.1113/jphysiol.2007.136051
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SYMPOSIUM REPORT

Glucocorticoids and insulin both modulate caloric intake through actions on the brain

 Mary F. Dallman1, James P. Warne1, Michelle T. Foster1 and Norman C. Pecoraro1

1 Department of Physiology, University of California San Francisco, CA 94143, USA

Glucocorticoids act primarily in a feed-forward fashion on brain to activate CNS pathways that implement wanting appropriate to physiological needs. Thus, depending on the available conditions, elevated glucocorticoids may augment the behavioural want to run, fight or feed. Although glucocorticoids stimulate intake of chow, fat and sucrose, insulin appears to sculpt calorie-associated desires toward foods high in fat, acting through hepatic branch afferents of the vagus nerve. Both conditions of reduced food allowance and chronic stress excite glucocorticoid-augmented central neural networks that may lead toward ultimate abdominal obesity.

(Received 10 May 2007; accepted after revision 6 June 2007; first published online 6 June 2007)
Corresponding author M. Dallman: Department of Physiology, Box 0444, University of California San Francisco, 513 Parnassus Avenue, San Francisco, CA 94143-0444, USA. Email: mary.dallman{at}ucsf.edu

This report was presented at The Journal of Physiology Symposium on Obesity and the central nervous system, Washington, DC, USA, 1 September 2007. It was commissioned by the Editorial Board and reflects the views of the author.




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