Hydration

HYD: Effect of Caffeinated Beverages on Fluids (2007)

• Assessment
  How do caffeinated beverages affect the need for other fluids in adults?

  • Conclusion

    Evidence indicates that consuming up to six mg of caffeine per kilogram of body weight per day does not impact the hydration status of healthy adults, above that of a placebo or non-caffeine-containing beverage.

  • Grade: I
    • Grade I means there is Good/Strong evidence supporting the statement;
    • Grade II is Fair;
    • Grade III is Limited/Weak;
    • Grade IV is Expert Opinion Only;
    • Grade V is Not Assignable.
    • High (A) means we are very confident that the true effect lies close to that of the estimate of the effect;
    • Moderate (B) means we are moderately confident in the effect estimate;
    • Low (C) means our confidence in the effect estimate is limited;
    • Very Low (D) means we have very little confidence in the effect estimate.
    • Ungraded means a grade is not assignable.
  • Evidence Summary: Caffeinated Beverages Effect on Hydration Status in Adults
    • Detail
    • Quality Rating Summary
      For a summary of the Quality Rating results, click here.
    • Worksheets
      • Armstrong LE, Pumerantz AC, Roti MW, Judelson DA, Watson G, Dias JC, Sokmen B, Casa DJ, Maresh CM, Lieberman H, Kellogg M. Fluid, electrolyte, and renal indices of hydration during 11 days of controlled caffeine consumption. Int J Sport Nutr Exerc Metab. 2005 Jun; 15 (3): 252-265.
      • Chambaz A, Meirim I, Decombaz J. Urinary caffeine after coffee consumption and heat dehydration. Int J Sports Med. 2001 Jul; 22 (5): 366-372.
      • Fiala KA, Casa DJ, Roti MW. Rehydration with a Caffeinated Beverage during the Nonexercise Periods of 3 Consecutive Days of 2-a-Day Practices. Int J Sport Nutr Exerc Metab. 2004 Aug; 14 (4): 419-29.
      • Frary CD, Johnson RK, Wang MQ. Food Sources and Intakes of Caffeine in the Diets of Persons in the United States. Journal of the American Dietetic Association. 2005; 105: 110-113.
      • Gonzalez-Alonso J, Heaps CL, Coyle EF. Rehydration after exercise with common beverages and water. Int J Sports Med. 1992 Jul; 13 (5): 399-406.
      • Grandjean AC, Reimers KJ, Bannick KE, Haven MC. The effect of caffeinated, non-caffeinated, caloric and non-caloric beverages on hydration. J Am Coll Nutr. 2000 Oct; 19 (5): 591-600.
      • Neuhauser-Berthold, Beine S, Verwied SC, Luhrmann PM. Coffee consumption and total body water homeostasis as measured by fluid balance and bioelectrical impedance analysis. Ann Nutr Metab. 1997; 41 (1): 29-36.
      • Roti MW, Casa DJ, Pumerantz AC, Watson G, Judelson DA, Dias JC, Ruffin K, Armstrong LE. Thermoregulatory Responses to Exercise in the Heat: Chronic Caffeine Intake Has No Effect. Aviat Space Environ Med. 2006 Feb; 77 (2): 124-129.
      • Scott D, Rycroft J, Aspen J, Chapman C, Brown B. The Effect of Drinking Tea at High Altitude on Hydration Status and Mood. Eur J Appl Physiol. 2004; Apr. 91 (4): 493-498.  
      • Stookey JD. The Diuretic Effects of Alcohol and Caffeine and Total Water Intake Misclassification. Eur J Epidemiol. 1999; Feb 15 (2): 181-188.
  • Search Plan and Results: HYD: Caffeinated Beverages in Adults 2006