No evidence of dehydration with moderate daily coffee intake: a counterbalanced cross-over study in a free-living population
AffiliationUniversity of Birmingham
MetadataShow full item record
AbstractIt is often suggested that coffee causes dehydration and its consumption should be avoided or significantly reduced to maintain fluid balance. The aim of this study was to directly compare the effects of coffee consumption against water ingestion across a range of validated hydration assessment techniques. In a counterbalanced cross-over design, 50 male coffee drinkers (habitually consuming 3-6 cups per day) participated in two trials, each lasting three consecutive days. In addition to controlled physical activity, food and fluid intake, participants consumed either 4X200 mL of coffee containing 4 mg/kg caffeine (C) or water (W). Total body water (TBW) was calculated pre- and post-trial via ingestion of Deuterium Oxide. Urinary and haematological hydration markers were recorded daily in addition to nude body mass measurement (BM). Plasma was analysed for caffeine to confirm compliance. There were no significant changes in TBW from beginning to end of either trial and no differences between trials (51.5±1.4 vs. 51.4±1.3 kg, for C and W, respectively). No differences were observed between trials across any haematological markers or in 24 h urine volume (2409±660 vs. 2428±669 mL, for C and W, respectively), USG, osmolality or creatinine. Mean urinary Na+ excretion was higher in C than W (p = 0.02). No significant differences in BM were found between conditions, although a small progressive daily fall was observed within both trials (0.4±0.5 kg; p<0.05). Our data show that there were no significant differences across a wide range of haematological and urinary markers of hydration status between trials. These data suggest that coffee, when consumed in moderation by caffeine habituated males provides similar hydrating qualities to water. © 2014 Killer et al.
CitationKiller S, Blannin A, Jeukendrup A (2014) 'No evidence of dehydration with moderate daily coffee intake: a counterbalanced cross-over study in a free-living population', PLoS ONE, 9 (1), .e84154.
PublisherPublic Library of Science
PubMed Central IDPMC3886980
The following license files are associated with this item:
- Creative Commons
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 International
- Hydration Status over 24-H Is Not Affected by Ingested Beverage Composition.
- Authors: Tucker MA, Ganio MS, Adams JD, Brown LA, Ridings CB, Burchfield JM, Robinson FB, McDermott JL, Schreiber BA, Moyen NE, Washington TA, Bermudez AC, Bennett MP, Buyckx ME
- Issue date: 2015
- Circadian variation and responsiveness of hydration biomarkers to changes in daily water intake.
- Authors: Perrier E, Demazières A, Girard N, Pross N, Osbild D, Metzger D, Guelinckx I, Klein A
- Issue date: 2013 Aug
- Relation between urinary hydration biomarkers and total fluid intake in healthy adults.
- Authors: Perrier E, Rondeau P, Poupin M, Le Bellego L, Armstrong LE, Lang F, Stookey J, Tack I, Vergne S, Klein A
- Issue date: 2013 Sep
- Coffee with High but Not Low Caffeine Content Augments Fluid and Electrolyte Excretion at Rest.
- Authors: Seal AD, Bardis CN, Gavrieli A, Grigorakis P, Adams JD, Arnaoutis G, Yannakoulia M, Kavouras SA
- Issue date: 2017
- Urinary caffeine after coffee consumption and heat dehydration.
- Authors: Chambaz A, Meirim I, Décombaz J
- Issue date: 2001 Jul