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At what stage in the drinking process does drinking water affect attention and memory? Effects of mouth rinsing and mouth drying in adults

  • Caroline J. EdmondsEmail author
  • Jamila Skeete
  • Eva Klamerus
  • Mark Gardner
Original Article

Abstract

Drinking water is important for health and there is an agreement that drinking water facilitates certain cognitive processes. However, the mechanism underlying the effect of drinking water on cognition is unknown. While attention performance is improved by even a very small drink, memory performance seems to require larger drinks for performance enhancement. This suggests that attention could be affected earlier in the drinking process than memory. We aimed to elucidate further the mechanism involved by investigating the stage during the drinking process influencing performance on cognitive tasks. To this end, we compared mouth rinsing and mouth drying. Mouth rinsing was expected to result in improved attention performance and would suggest that the mechanism responsible is located in the mouth and occurs early in the drinking process, before swallowing. Eighty-seven adults participated in either a treatment (mouth rinsing or mouth drying) or control (no intervention) condition. They were assessed at baseline and 20 min later after intervention on measures of visual attention, short-term memory, subjective thirst and mood. Our results showed that mouth rinsing improved visual attention, but not short-term memory, mood or subjective thirst. Mouth drying did not affect performance. Our results support the hypothesis that different mechanisms underlie the effect of drinking water on different cognitive processes. They suggest that merely sipping water, as opposed to having a large drink, can improve attention.

Notes

Funding

This research did not receive any specific grant from funding sources in the public, commercial or not-for-profit sectors. This work was part funded by money given to the first author by Nestec for an unrelated project—they had no influence in instigating, designing, analysing, interpreting or submitting the paper.

Compliance with ethical standards

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. All procedures were approved by the Department of Psychology ethics committee, University of Westminster (ETH1617-0099) and the University of East London ethics committee (UREC 1516 74).

Informed consent

Written informed consent was obtained from all participants prior to participation.

References

  1. Assael, B., Cipolli, M., Meneghelli, I., Passiu, M., Cordioli, S., Tridello, G., et al. (2012). Italian children go to school with a hydration deficit. Journal of Nutritional Disorders and Therapy, 02(03), 1–6.  https://doi.org/10.4172/2161-0509.1000114.CrossRefGoogle Scholar
  2. Barker, M., Benefer, M. D., Russell, J. M., Lepicard, E. M., Constant, F., Hawili, N., & Friedlander, G. (2012). Hydration deficit after breakfast intake among British schoolchildren. Experimental Biology, 26, 10–11.Google Scholar
  3. Benelam, B., & Wyness, L. (2010). Hydration and health: a review. Nutrition Bulletin, 35(1), 3–25.  https://doi.org/10.1111/j.1467-3010.2009.01795.x.CrossRefGoogle Scholar
  4. Benton, D., Braun, H., Cobo, J. C., Edmonds, C. J., Elmadfa, I., El-Sharkawy, A., et al. (2015). Executive summary and conclusions from the European Hydration Institute Expert Conference on human hydration, health, and performance. Nutrition Reviews, 73, 148–150.  https://doi.org/10.1093/nutrit/nuv056.CrossRefGoogle Scholar
  5. Benton, D., & Burgess, N. (2009). The effect of the consumption of water on the memory and attention of children. Appetite, 53(1), 143–146.  https://doi.org/10.1016/j.appet.2009.05.006.CrossRefGoogle Scholar
  6. Bonnet, F., Lepicard, E. M., Cathrin, L., Letellier, C., Constant, F., Hawili, N., & Friedlander, G. (2012). French children start their school day with a hydration deficit. Annals of Nutrition and Metabolism, 60(4), 257–263.  https://doi.org/10.1159/000337939.CrossRefGoogle Scholar
  7. Booth, P., Taylor, B., & Edmonds, C. J. (2012). Water supplementation improves visual attention and fine motor skills in schoolchildren. Education and Health, 30(3), 75–79.Google Scholar
  8. Brunstrom, J. (2002). Effects of mouth dryness on drinking behavior and beverage acceptability. Physiology and Behavior, 76(3), 423–429. http://www.ncbi.nlm.nih.gov/pubmed/12117579. Accessed 28 Dec 2015
  9. Brunstrom, J., & Macrae, A. (1997). Effects of temperature and volume on measures of mouth dryness, thirst and stomach fullness in males and females. Appetite, 29(1), 31–42.  https://doi.org/10.1006/appe.1997.0089.CrossRefGoogle Scholar
  10. Brunstrom, J. M., Macrae, A. W., & Roberts, B. (1997). Mouth-state dependent changes in the judged pleasantness of water at different temperatures. Physiology and Behavior, 61(5), 667–669.CrossRefGoogle Scholar
  11. Chambers, E. S., Bridge, M. W., & Jones, D. (2009). Carbohydrate sensing in the human mouth: effects on exercise performance and brain activity. The Journal of physiology, 587(Pt 8), 1779–1794.  https://doi.org/10.1113/jphysiol.2008.164285.CrossRefGoogle Scholar
  12. Cohen, S. (1983). After effects of stress on human performance during a heat acclimatization regimen. Aviation, Space and Environmental Medicine, 54, 709–713.Google Scholar
  13. D’Anci, K. E. D., Constant, F., & Rosenberg, I. H. (2006). Hydration and cognitive function in children. Nutrition in Clinical Care, 64(10), 457–464.  https://doi.org/10.1301/nr.2006.oct.457.Google Scholar
  14. Dawkins, L., Shahzad, F. Z., Ahmed, S. S., & Edmonds, C. J. (2011). Expectation of having consumed caffeine can improve performance and mood. Appetite, 57(3), 597–600.  https://doi.org/10.1016/j.appet.2011.07.011.CrossRefGoogle Scholar
  15. Edmonds, C. J., Booth, P., Carey, K., Stafford, A., Walker, A., & Gardner, M. R. (2019). Teachers’ attitudes to children drinking water in the classroom and strategies for increasing consumption : a pilot study a b c b. In Poster presented at the British Feeding and Drinking Group conference Swansea.  https://doi.org/10.13140/rg.2.2.13883.67361
  16. Edmonds, C. J., & Burford, D. (2009). Should children drink more water? The effects of drinking water on cognition in children. Appetite, 52(3), 776–779.  https://doi.org/10.1016/j.appet.2009.02.010.CrossRefGoogle Scholar
  17. Edmonds, Caroline J., Crombie, R., Ballieux, H., Gardner, M. R., & Dawkins, L. (2013a). Water consumption, not expectancies about water consumption, affects cognitive performance in adults. Appetite, 60(1), 148–153.  https://doi.org/10.1016/j.appet.2012.10.016.CrossRefGoogle Scholar
  18. Edmonds, Caroline J., Crombie, R., & Gardner, M. R. (2013b). Subjective thirst moderates changes in speed of responding associated with water consumption. Frontiers in Human Neuroscience, 7(July), 1–8.  https://doi.org/10.3389/fnhum.2013.00363.Google Scholar
  19. Edmonds, C. J., Crosbie, L., Fatima, F., Hussain, M., Jacob, N., & Gardner, M. (2017). Dose-response effects of water supplementation on cognitive performance and mood in children and adults. Appetite, 108, 464–470.  https://doi.org/10.1016/j.appet.2016.11.011.CrossRefGoogle Scholar
  20. Edmonds, C. J., Harte, N., & Gardner, M. R. (2018). How does drinking water affect attention and memory? The effect of mouth rinsing and mouth drying on children’s performance. Physiology and Behavior, 194, 233–238.  https://doi.org/10.1016/j.physbeh.2018.06.004.CrossRefGoogle Scholar
  21. Edmonds, Caroline J., & Jeffes, B. (2009). Does having a drink help you think? 6–7-Year-old children show improvements in cognitive performance from baseline to test after having a drink of water. Appetite, 53(3), 469–472.  https://doi.org/10.1016/j.appet.2009.10.002.CrossRefGoogle Scholar
  22. Fadda, R., Rapinett, G., Grathwohl, D., Parisi, M., Fanari, R., Maria, C., & Schmitt, J. (2012). Effects of drinking supplementary water at school on cognitive performance in children. Appetite, 59(3), 730–737.  https://doi.org/10.1016/j.appet.2012.07.005.CrossRefGoogle Scholar
  23. Fillmore, M., & Vogel-Sprott, M. (1992). Expected effect of caffeine on motor performance predicts the type of response to placebo. Psychopharmacology (Berl), 106, 209–214.CrossRefGoogle Scholar
  24. Francesconi, R., Hubbard, R. W., Szlyk, P. C., Schnakenberg, D., Carlson, D., Leva, N., et al. (1987). Urinary and hematologic indexes of hypohydration. Journal of Applied Physiology, 62(3), 1271–1276.CrossRefGoogle Scholar
  25. Gandy, J. (2017). Fluid—food fact sheet. www.bda.uk.com/foodfacts. Accessed 30 April 2019
  26. Grandjean, A. C., & Campbell, S. M. (2004). Hydration: Fluids for life. Washington, DC: ILSI.Google Scholar
  27. Greendale, G. A., Kritz-Silverstein, A., Seeman, T., & Barrett-Connor, E. (2000). Higher basal cortisol predicts verbal memory loss in postmenopausal women: Rancho Bernardo Study: Brief reports. Journal of the American Geriatrics Sociey, 48, 1655–1658.CrossRefGoogle Scholar
  28. Hart, S. G. (1988). Development of NASA-TLX (Task Load Index): Results of empirical and theoretical research. Advances in Psychology, 52, 139–183.CrossRefGoogle Scholar
  29. Health and Safety Executive. (2013). Workplace health, safety and welfare : Workplace (health, safety and welfare) regulations 1992. http://www.hse.gov.uk/pUbns/priced/l24.pdf. Accessed 2 Apr 2019
  30. Health and Safety Executive. (2019). Case 187—employer refuses to allow employees bottles of water on retail floor due to health and safety. http://www.hse.gov.uk/myth/myth-busting/2013/case187-bottled-water.htm. Accessed 29 April 2019
  31. Jéquier, E., & Constant, F. (2010). Water as an essential nutrient: The physiological basis of hydration. European Journal of Clinical Nutrition, 64(2), 115–123.  https://doi.org/10.1038/ejcn.2009.111.CrossRefGoogle Scholar
  32. Jeukendrup, A., Rollo, I., & Carter, J. (2013). Carbohydrate mouth rinse: performance effects and mechanisms. Sports Science, 26(118), 1–8. https://secure.footprint.net/gatorade/prd/gssiweb/pdf/118_CarbohydrateMouthRinse-Jeukendrup_SSE.pdf. Accessed 16 May 2017
  33. Kaushik, A., Mullee, M. A., Bryant, T. N., & Hill, C. M. (2007). A study of the association between children’ s access to drinking water in primary schools and their fluid intake : Can water be ‘cool’ in school ? Child: Care, Health and Development, 33(4), 409–415.  https://doi.org/10.1111/j.1365-2214.2006.00721.x.Google Scholar
  34. Kenney, E. L., Long, M. W., Cradock, A. L., & Gortmaker, S. L. (2015). Prevalence of inadequate hydration among US children and disparities by gender and race/ethnicity: National Health and Nutrition Examination Survey, 2009–2012. American Journal of Public Health, 105(8), e113–e118.  https://doi.org/10.2105/AJPH.2015.302572.CrossRefGoogle Scholar
  35. Kirschbaum, C., Wolk, O. T., May, M., Wippich, W., & Hellhammer, D. H. (1996). Stress- and treatment-induced elevations of cortisol levels associated with impaired declarative memory in healthy adults. Life Sciences, 58, 1475–1483.CrossRefGoogle Scholar
  36. Lotshaw, S. C., Bradley, J. R., & Brooks, L. R. (1996). Illustrating caffeine’s pharmacological and expectancy effects using a balanced placebo design. Journal of Drug Education, 26, 13–24.CrossRefGoogle Scholar
  37. Masento, N. A., Golightly, M., Field, D. T., Butler, L. T., & van Reekum, C. M. (2014). Effects of hydration status on cognitive performance and mood. British Journal of Nutrition, 111(10), 1841–1852.  https://doi.org/10.1017/S0007114513004455.CrossRefGoogle Scholar
  38. May, M., & Jordan, J. (2011). The osmopressor response to water drinking. American Journal of Physiology. Regulatory, Integrative and Comparative Physiology, 300, R40–R46.CrossRefGoogle Scholar
  39. Neave, N., Scholey, A. B., Emmett, J. R., Moss, M., Kennedy, D. O., & Wesnes, K. A. (2001). Water ingestion improves subjective alertness, but has no effect on cognitive performance in dehydrated healthy young volunteers. Appetite, 37, 255–256.  https://doi.org/10.1006/appe.2001.0429.CrossRefGoogle Scholar
  40. Obika, L. F. O., Idu, F. K., George, G. O., Ajayi, O. I., & Mowoe, R. S. (2009). Thirst perception and drinking in euhydrate and dehydrate human subjects. Nigerian Journal of Physiological Sciences, 24(1), 25–32.  https://doi.org/10.4314/njps.v24i1.46377.CrossRefGoogle Scholar
  41. Perry, C. S., Rapinett, G., Glaser, N. S., & Ghetti, S. (2015). Hydration status moderates the effects of drinking water on children’s cognitive performance. Appetite, 95, 520–527.  https://doi.org/10.1016/j.appet.2015.08.006.CrossRefGoogle Scholar
  42. Posner, M. I. (2008). Measuring alertness. Annals of the New York Academy of Sciences, 1129, 193–199.  https://doi.org/10.1196/annals.1417.011.CrossRefGoogle Scholar
  43. Ritz, P., Vol, S., Berrut, G., Tack, I., Arnaud, M. J., & Tichet, J. (2008). Influence of gender and body composition on hydration and body water spaces. Clinical Nutrition, 27(5), 740–746.  https://doi.org/10.1016/j.clnu.2008.07.010.CrossRefGoogle Scholar
  44. Rogers, P. J., Kainth, A., & Smit, H. J. (2001). Rapid communication A drink of water can improve or impair mental performance depending on small differences in thirst. Appetite, 36, 57–58.  https://doi.org/10.1006/appe.2000.0374.CrossRefGoogle Scholar
  45. Rollo, I., Homewood, G., Williams, C., Carter, J., & Goosey-Tolfrey, V. L. (2015). The influence of carbohydrate mouth rinse on self-selected intermittent running performance. International Journal of Sport Nutrition and Exercise Metabolism, 25(6), 550–558.CrossRefGoogle Scholar
  46. Rolls, B. J., & Rolls, E. T. (1982). Thirst. Cambridge: Cambridge University Press.Google Scholar
  47. Sinclair, J., Bottoms, L., Flynn, C., Bradley, E., Alexander, G., McCullagh, S., et al. (2013). The effect of different durations of carbohydrate mouth rinse on cycling performance. Physiology and Nutrition, 14(3), 259–264.Google Scholar
  48. The Education (Nutritional Standards and Requirements for School Food) (England) Regulations. (2007). Statutory instrument. London: Nutritional Standards and Requirements for School Food.Google Scholar
  49. United States Department of Agriculture. (2016). Resources for making potable water available in schools and child care facilities. Washington: United States Department of Agriculture.Google Scholar
  50. Young, H. A., & Benton, D. (2016). The use of moderated mediated analysis to study the influence of hypo-hydration on working memory. Nutricion Hospitalaria, 33(July), 71–75.  https://doi.org/10.20960/nh.320.Google Scholar
  51. Zimmerman, C. A., Lin, Y.-C., Leib, D. E., Huey, E. L., Daly, G. E., Chen, Y., & Knight, Z. A. (2016). Thirst neurons anticipate the homeostatic consequences of eating and drinking. Nature, 537(7622), 680–684.  https://doi.org/10.1021/acsnano.5b07425.Molecular.CrossRefGoogle Scholar

Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of PsychologyUniversity of East LondonStratfordUK
  2. 2.Department of PsychologyUniversity of WestminsterLondonUK

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