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Science 22 February 1980:
Vol. 207. no. 4433, pp. 837 - 842
DOI: 10.1126/science.6928327
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Articles
Science, Vol 207, Issue 4433, 837-842
Copyright © 1980 by American Association for the Advancement of Science
Animal anorexias
N Mrosovsky
and
DF Sherry
Eating very little in the presence of food or failure to serach for food has been documented in various species during the hibernation season, incubation, molting, and defense of the territory or harem. At these times feeding competes with other, more important activities. One way to avoid conflicts between feeding and these other activities to lower the programmed weight or set-point for body fat. Experiments on mammalian hibernators and incubating birds provide evidence that set-points are indeed lowered. Failure to eat in these two examples depends on anorexia, loss of appetite. A review of other examples suggests that conceptualization in terms of lowered set-points provides a unified and testable way of understanding many naturally occurring instances of fasting in the animal kingdom. Finally, spontaneous animal anorexias are contrasted with attempts by people to lose weight.
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