Endocrine controls of eating: CCK, leptin, and ghrelin

Physiology & Behavior
Nori Geary

Abstract

The peripheral physiological and central nervous mechanisms contributing to the control of eating present formidable challenges to experimental analysis. One of the most productive approaches to these challenges has been endocrinological. This review introduces the endocrine control of eating by considering three hormonal signals that have been hypothesized to control hunger or satiation, cholecystokinin CCK, leptin, and ghrelin. The roles of these molecules in humans and in rodents are considered against a set of criteria established in classical endocrinology for establishing physiological endocrine action. It is concluded that according to these criteria, CCK's satiating action in humans is the best-established physiological endocrine action. In contrast, support for endocrine actions of leptin in satiation and of ghrelin in hunger is incomplete, and areas urgently requiring further research are identified. Finally, a review of work on these three hormones suggests the utility of a new conceptual scheme for understanding the endocrine control of eating. This scheme distinguishes between endocrine, in which the stimuli for hormonal secretion and the effect of secretion on eating are tightly coupled, and endocrine effects, in ...Continue Reading

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