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The effect on hydration of two diets, one with and one without plain water
Ann C Grandjean1, Kristin J Reimers, Mary C Haven
1The Center for Human Nutrition, School of Allied Health Professions, University of Nebraska Medical Center, 502 South 44th Street, Omaha, NE 68105, USA. agrandje@unmc.edu
Objective:
To measure the effect on hydration of two regimens, one that included drinking water as part of the dietary beverages and one that did not.
Methods:
In healthy, sedentary subjects, two different diets were evaluated for their effect on hydration. Trial A provided plain water to drink as part of the beverages served. Trial B omitted plain water from the beverages served. Twenty-seven males, during two three-day confinement periods, consumed one of two diets in a random, crossover and counterbalanced fashion, while diet, physical activity and environment were controlled and monitored. Body weight and 24-hour urine volumes were measured. Pre- and post-trial urine samples and 24-hour urines were assayed for osmolality, specific gravity, chloride, sodium and potassium, and sodium/potassium ratio was calculated. Twenty-four hour creatinine levels were determined.
Results:
No differences (p > 0.05) were found between trials for body weight or other indicators of hydration status measured.
Conclusions:
Inclusion of plain drinking water compared to exclusion of plain drinking water in the diet did not affect the markers of hydration used in this study.