| Title |
No Evidence of Dehydration with Moderate Daily Coffee Intake: A Counterbalanced Cross-Over Study in a Free-Living Population
|
|---|---|
| Published in |
PLOS ONE, January 2014
|
| DOI | 10.1371/journal.pone.0084154 |
| Pubmed ID | |
| Authors |
Sophie C. Killer, Andrew K. Blannin, Asker E. Jeukendrup |
| Abstract |
It 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 4×200 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. |
X Demographics
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Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United States | 534 | 16% |
| Japan | 270 | 8% |
| United Kingdom | 113 | 3% |
| Canada | 57 | 2% |
| Korea, Republic of | 49 | 2% |
| Australia | 40 | 1% |
| Spain | 29 | <1% |
| Germany | 26 | <1% |
| Netherlands | 25 | <1% |
| Other | 249 | 8% |
| Unknown | 1870 | 57% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 2862 | 88% |
| Practitioners (doctors, other healthcare professionals) | 179 | 5% |
| Scientists | 170 | 5% |
| Science communicators (journalists, bloggers, editors) | 45 | 1% |
| Unknown | 6 | <1% |
Mendeley readers
The data shown below were compiled from readership statistics for 332 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United States | 6 | 2% |
| Austria | 2 | <1% |
| Brazil | 2 | <1% |
| Australia | 1 | <1% |
| Portugal | 1 | <1% |
| Italy | 1 | <1% |
| Canada | 1 | <1% |
| United Kingdom | 1 | <1% |
| Greece | 1 | <1% |
| Other | 1 | <1% |
| Unknown | 315 | 95% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Bachelor | 65 | 20% |
| Student > Master | 64 | 19% |
| Researcher | 28 | 8% |
| Student > Ph. D. Student | 25 | 8% |
| Other | 22 | 7% |
| Other | 62 | 19% |
| Unknown | 66 | 20% |
| Readers by discipline | Count | As % |
|---|---|---|
| Medicine and Dentistry | 67 | 20% |
| Sports and Recreations | 45 | 14% |
| Agricultural and Biological Sciences | 43 | 13% |
| Nursing and Health Professions | 31 | 9% |
| Biochemistry, Genetics and Molecular Biology | 16 | 5% |
| Other | 56 | 17% |
| Unknown | 74 | 22% |
Attention Score in Context
This research output has an Altmetric Attention Score of 2517. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 13 April 2024.
All research outputs
#3,072
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Outputs from PLOS ONE
#31
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Outputs of similar age
#17
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Outputs of similar age from PLOS ONE
#1
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