| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
Original Research |
The Center for Human Nutrition, (A.C.G., K.J.R.), Omaha, Nebraska
School of Allied Health Professions, University of Nebraska Medical Center (M.C.H.), Omaha, Nebraska
Bannick Consulting, Isle, Minnesota (K.E.B.)
Address reprint requests to: Ann C. Grandjean, Ed.D., The Center for Human Nutrition, 502 South 44th Street, Room 3007, Omaha, NE 68105. E-mail: agrandjean{at}unmc.edu
Objective: To examine the effect of various combinations of beverages on hydration status in healthy free-living adult males.
Methods: In a counterbalanced, crossover manner, 18 healthy adult males ages 24 to 39, on four separate occasions, consumed water or water plus varying combinations of beverages. Clinical guidelines were used to determine the fluid allowance for each subject. The beverages were carbonated, caffeinated caloric and non-caloric colas and coffee. Ten of the 18 subjects consumed water and carbonated, non-caffeinated, citrus soft drink during a fifth trial. Body weight, urine and blood assays were measured before and after each treatment.
Results: Slight body weight loss was observed on all treatments, with an average of 0.30% for all treatments. No differences (p>0.05) among treatments were found for body weight changes or any of the biochemical assays. Biochemical assays conducted on first voids and 24-hour urines included electrolytes, creatine, osmolality and specific gravity. Blood samples were analyzed for hemoglobin, hematocrit, electrolytes, osmolality, urea nitrogen, creatinine and protein.
Conclusions: This preliminary study found no significant differences in the effect of various combinations of beverages on hydration status of healthy adult males. Advising people to disregard caffeinated beverages as part of the daily fluid intake is not substantiated by the results of this study. The across-treatment weight loss observed, when combined with data on fluid-disease relationships, suggests that optimal fluid intake may be higher than common recommendations. Further research is needed to confirm these results and to explore optimal fluid intake for healthy individuals.
Key words: hydration, caffeine, fluid balance, dehydration, 24-h urine volume, fluid requirements
This article has been cited by other articles:
|
|
 |
|
  S. M. Campbell Hydration Needs throughout the Lifespan J. Am. Coll. Nutr., October 1, 2007; 26(suppl_5): 585S - 587S. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 L. R. Vartanian, M. B. Schwartz, and K. D. Brownell Effects of Soft Drink Consumption on Nutrition and Health: A Systematic Review and Meta-Analysis Am J Public Health, April 1, 2007; 97(4): 667 - 675. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 D. Short When science met the consumer: the role of industry Am. J. Clinical Nutrition, July 1, 2005; 82(1): 256S - 258S. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. C. Grandjean, K. J. Reimers, M. C. Haven, and G. L. Curtis The Effect on Hydration of Two Diets, One with and One without Plain Water J. Am. Coll. Nutr., April 1, 2003; 22(2): 165 - 173. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 H. Valtin "Drink at least eight glasses of water a day." Really? Is there scientific evidence for "8 x 8"? Am J Physiol Regulatory Integrative Comp Physiol, November 1, 2002; 283(5): R993 - R1004. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
