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Anticipatory Physiological Regulation in Feeding Biology

  • Michael L. Power
  • Jay Schulkin
Chapter

Abstract

Anticipatory physiological responses relevant to feeding biology were first described by Pavlov. These responses, termed cephalic phase responses, help prepare the digestive system and cue the appropriate metabolic pathways to meet the challenges associated with food ingestion. Cephalic phase responses represent a fundamental concept in regulatory physiology: anticipatory changes in state to meet expected needs. For example, there is a preabsorptive rise in circulating insulin elicited by cues that feeding is imminent; blocking this cephalic phase insulin response results in poor glucose control and, interestingly, in the ingestion of smaller meals. Cephalic phase responses have been shown to improve the efficiency of digestion and metabolism; they have been implicated in appetite and satiety as well. In this essay we examine cephalic phase responses from a functional, adaptive perspective, and consider their roles in the initiation and cessation of feeding. We consider the cephalic phase responses of insulin and ghrelin in detail. Both of these molecules act to influence physiology and metabolism in response to feeding cues. Both have been implicated as important signaling molecules in neural circuits that regulate appetite and satiety and both have been shown to be able to be entrained to a circadian rhythm. Central insulin reduces appetite; interestingly peripheral insulin acts to enable increased ingestion. In both cases it can be seen as defending homeostasis. Ghrelin is the only gut peptide known to stimulate feeding. Ghrelin also has peripheral effects that serve to assist digestion and absorption. Ghrelin appears both to stimulate feeding and to prepare the gut for food ingestion. People and rats can be trained to expect food at predictable times. When that happens circulating ghrelin will rise in anticipation of a meal, but more interestingly, circulating ghrelin will then fall after meal times even if no food is ingested, to rise again before the next scheduled meal. This is an excellent example of the function of anticipatory physiological responses. They serve to enhance the probability that animals will be in the appropriate physiological state at different parts of the circadian cycle. These anticipatory responses not only reflect long-term evolutionary adaptations; some, such as the regulation of ghrelin, respond to environmental inputs and thus can be adjusted by learning. Physiology, coordinated by the brain, anticipates as well as reacts.

Keywords

Ghrelin Concentration Ghrelin Secretion Internal Milieu Sham Feeding Cephalic Phase 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Abbreviations

AgRP

Agouti-related protein

CCK

Cholecystokinin

CNS

Central nervous system

GHS receptor

Growth hormone secretory receptor

mRNA

Messenger ribonucleic acid

NPY

Neuropeptide Y

Ob-Rb

Short, soluble form of the leptin receptor

POMC

Proopiomelanocortin

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Research DepartmentAmerican College of Obstetricians and GynecologistsWashingtonUSA
  2. 2.Nutrition Laboratory, Conservation Ecology CenterSmithsonian National Zoological ParkWashingtonUSA

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