Abstract
The normal nocturnal feeding patterns of rats could be changed to a daytime pattern simply by providing a palatable diet during daylight hours. This effect was larger in females than males. The shift in feeding patterns was accompanied by corresponding shifts in diurnal body temperature and water intake rhythms. Running wheel activity remained unmodified. Access to a 0.25 percent saccharin solution as the only fluid source during daylight also produced a shift in the diurnal distribution of fluid intake, but left feeding unmodified. Ventromedial hypothalamic (VMH) lesions eliminated the normal diurnal distribution of feeding but did not modify the shift in feeding patterns resulting from presentation of a more palatable diet during daylight hours. However, sex differences in feeding patterns were abolished by VMH lesions.
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