A randomized trial to assess the potential of different beverages to affect hydration status: development of a beverage hydration index

Maughan, R.J., Watson, P., Cordery, P.A.A., Walsh, N.P., Oliver, S.J., Dolci, A., Rodriguez-Sanchez, N. and Galloway, S.D.R. 2016. A randomized trial to assess the potential of different beverages to affect hydration status: development of a beverage hydration index. American Journal of Clinical Nutrition. 103, pp. 717-723. https://doi.org/10.3945/ajcn.115.114769

TitleA randomized trial to assess the potential of different beverages to affect hydration status: development of a beverage hydration index
AuthorsMaughan, R.J., Watson, P., Cordery, P.A.A., Walsh, N.P., Oliver, S.J., Dolci, A., Rodriguez-Sanchez, N. and Galloway, S.D.R.
Abstract

Background: The identification of beverages that promote longer- term fluid retention and maintenance of fluid balance is of real clinical and practical benefit in situations in which free access to fluids is limited or when frequent breaks for urination are not desirable. The postingestion diuretic response is likely to be influenced by several beverage characteristics, including the volume ingested, energy den- sity, electrolyte content, and the presence of diuretic agents. Objective: This study investigated the effects of 13 different com- monly consumed drinks on urine output and fluid balance when ingested in a euhydrated state, with a view to establishing a beverage hydration index (BHI), i.e., the volume of urine produced after drinking expressed relative to a standard treatment (still water) for each beverage.
Design: Each subject (n = 72, euhydrated and fasted male subjects) ingested 1 L still water or 1 of 3 other commercially available beverages over a period of 30 min. Urine output was then collected for the subsequent 4 h. The BHI was corrected for the water content of drinks and was calculated as the amount of water retained at 2 h after ingestion relative to that observed after the ingestion of still water.
Results: Total urine masses (mean 6 SD) over 4 h were smaller than the still-water control (1337 6 330 g) after an oral rehydration solution (ORS) (1038 6 333 g, P , 0.001), full-fat milk (1052 6 267 g, P , 0.001), and skimmed milk (1049 6 334 g, P , 0.001). Cumulative urine output at 4 h after ingestion of cola, diet cola, hot tea, iced tea, coffee, lager, orange juice, sparkling water, and a sports drink were not different from the response to water ingestion. The mean BHI at 2 h was 1.54 6 0.74 for the ORS, 1.50 6 0.58 for full- fat milk, and 1.58 6 0.60 for skimmed milk.
Conclusions: BHI may be a useful measure to identify the short- term hydration potential of different beverages when ingested in a euhydrated state.

Keywordsfluid balance dehydration rehydration euhydration electrolytes macronutrients gastric emptying intestinal absorption renal excretion urine
JournalAmerican Journal of Clinical Nutrition
Journal citation103, pp. 717-723
ISSN0002-9165
Year2016
Digital Object Identifier (DOI)https://doi.org/10.3945/ajcn.115.114769
Web address (URL)http://ajcn.nutrition.org/content/early/2015/12/23/ajcn.115.114769.abstract
Publication dates
Published2016

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