title: Restricting fluid intake during a single meal did not affect food intake in older adults.
abstract: Restricting fluid intake has been shown to decrease ad libitum food intake in animals and young adult humans. The purpose of this study was to determine if restricting fluid intake during a meal affects food intake in older adults. In a crossover counterbalanced design, 24 subjects (11 m, 13 f), 61-95 years, received lunch at a congregate meal site. Identical meals were accompanied by a volume of water equal to either 40% (restricted) or 100% (control) of each subject's usual lunch fluid intake. Pre-meal urine osmolality and specific gravity were used as indicators of hydration status. Weighed food intake was not different between the restricted and control conditions (400 g/2875 kJ and 408 g/2971 kJ, respectively). No significant correlations were found between urine osmolality or specific gravity and food intake, either in response to fluid restriction or per kg body weight. These results suggest that the appetite of healthy free-living older adults is not affected by fluid restriction during a single eating episode.
authors.affiliation: Department of Dietetics and Nutrition, Florida International University, University Park Campus, Miami, FL 33199, USA.
authors.forename: Armando J
authors.initials: AJ
authors.lastname: Triana
authors.forename: Victor
authors.initials: V
authors.lastname: Apanius
authors.forename: Charlotte
authors.initials: C
authors.lastname: Richmond
authors.forename: Victoria Hammer
authors.initials: VH
authors.lastname: Castellanos
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000704:Analysis of Variance; D018592:Cross-Over Studies; D003681:Dehydration / Q000652:urine; D004435:Eating / Q000502:physiology*; D002149:Energy Intake / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D014868:Water Deprivation / Q000502:physiology*