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Fluid Replacement and Heat Stress, 1993

Pp. 161-167. Washington, D.C.

National Academy Press

13

Palatability and Fluid Intake

Barbara J. Rolls1

INTRODUCTION

People consume fluids in response to a variety of physiological, psychological, and environmental stimuli. In this paper, I discuss some of the physiological changes that can affect fluid intake in man and why people drink spontaneously when they have free access to water. The sensations accompanying dehydration are also considered, as is rehydration and its accuracy in restoring fluid deficits. Finally, the effects of palatability of the availabel fluids on thirst satisfaction and consumption are discussed.

PHYSIOLOGICAL THIRST STIMULI

During fluid restriction, both the cellular and extracellular body fluid compartments are depleted. Changes in both compartments are associated with thirst and drinking. There is clear experimental evidence that dehydration of the cellular compartment is a potent thirst stimulus. For example, the effects of double-blind intravenous infusions of hypertonic saline (0.45 M) and isotonic saline (0.15 M) were compared in seven healthy young men (Phillips et al., 1985b). Only the hypertonic saline significantly increased

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Barbara J. Rolls, The Pennsylvania State University, 104 Benedict House, University Park, PA 16802-2311



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