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ISRAEL RAMIREZ Monell Chemical Senses Center, Philadelphia, Ramirez, Israel. Stimulation of fluid intake by nutrients: oil is less ive than . Am. J. Physiol. 272 (Regulatory Integrative Comp. Physiol. 41): R289-R293, 1997.-It has been thought that the ability of nutrients to reinforce ingestion is related to their ability to provide metabolizable energy. This implies that the reinforcing of should be similar to that of fat. To test this concept, rats were trained in an apparatus that infused water or nutritive solutions/suspensions into their stomachs every time they drank a sapid solution. Each training trial lasted for 1 day. Successive training trials were interspersed by l-day periods in which the rats were infused with plain water and offered plain water or a tastant different from the training taste (i.e., taste paired with vehicle infusion). Three different sapid solutions were used: a sweet solution (), a nonsweet solution (NaCl), and a mixture of sweet and nonsweet. Starch or maltodextrin infusions strongly and consistently stimulated intake of these solutions. Oil infusions also significantly stimulated intake, but feebly and less consistently. Indeed, in the one experiment in which the only sapid fluid offered was , oil infusions had no significant . Two
AJP - Regulatory, Integrative and Comparative Physiology – The American Physiological Society
Published: Jan 1, 1997
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