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Science 25 March 2005:
Vol. 307. no. 5717, pp. 1909 - 1914
DOI: 10.1126/science.1109951
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Review

The Gut and Energy Balance: Visceral Allies in the Obesity Wars

Michael K. Badman and Jeffrey S. Flier*

In addition to digesting and assimilating nutrients, the intestine and associated visceral organs play a key sensing and signaling role in the physiology of energy homeostasis. The gut, the pancreatic islets of Langerhans, elements in the portal vasculature, and even visceral adipose tissue communicate with the controllers of energy balance in the brain by means of neural and endocrine pathways. Signals reflecting energy stores, recent nutritional state, and other parameters are integrated in the central nervous system, particularly in the hypothalamus, to coordinate energy intake and expenditure. Our understanding of regulatory neural circuits and the signaling molecules that influence them has progressed rapidly, particularly after the discovery of the adipocyte hormone leptin. These discoveries have led to exploration of novel routes for obesity control, some of which involve gut-derived pathways.

Division of Endocrinology, Diabetes, and Metabolism, Beth Israel Deaconess Medical Center, Finard 202, 330 Brookline Avenue, Boston, MA 02215, USA.

* To whom correspondence should be addressed. E-mail: JFlier{at}bidmc.harvard.edu

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