Comprehensive Hydration Guide

Evidence-based fluid recommendations for various medical conditions, age groups, and activity levels

Diarrhea

Oral Rehydration Solution (WHO Formula)

  1. 1 liter clean drinking water
  2. 6 teaspoons sugar (25g)
  3. ½ teaspoon salt (2.9g)
  4. Optional: ½ cup orange juice for potassium

Administration Guidelines

  • Infants: 50-100mL after each loose stool
  • Children: 100-200mL after each loose stool
  • Adults: As much as tolerated, up to 2L/day

Note: Continue breastfeeding for infants. For children and adults, resume normal diet as soon as possible.

Reference: World Health Organization. (2005). The Treatment of Diarrhoea: A Manual for Physicians and Other Senior Health Workers.

Vomiting

Rehydration Strategy

  • Wait 10 minutes after vomiting before starting fluids
  • Begin with 5mL (1 teaspoon) every 5 minutes
  • Gradually increase as tolerated
  • Use commercial ORS or homemade solution

Reference: Guarino, A., et al. (2014). Journal of Pediatric Gastroenterology and Nutrition, 59(1), 132-152.

Infants (0-12 months)

Daily Fluid Requirements

  • 0-6 months: 150-200mL/kg/day (from breast milk or formula)
  • 6-12 months: 120-150mL/kg/day (including complementary foods)

Important: Never dilute breast milk or formula. Plain water should be limited to avoid hyponatremia.

Reference: American Academy of Pediatrics. (2019). Pediatric Nutrition Handbook.

Elderly (65+ years)

Special Considerations

  • Recommended intake: 30mL/kg/day
  • Increased risk of dehydration due to reduced thirst sensation
  • Monitor for signs of dehydration: confusion, dry mouth, sunken eyes
  • May need scheduled drinking times rather than relying on thirst

Reference: Hooper, L., et al. (2014). Cochrane Database of Systematic Reviews.

Athletes & High Intensity

Hydration Strategy

  • Pre-hydration: 5-7mL/kg 4 hours before exercise
  • During: 0.4-0.8L/hour depending on sweat rate
  • Post: 1.5L per kg body weight lost
  • For exercise >1 hour, include electrolytes (20-30mEq/L sodium)

Reference: Sawka, M.N., et al. (2007). Medicine & Science in Sports & Exercise, 39(2), 377-390.

Office Workers

Recommended Intake

  • Men: 3.7L/day (from all sources)
  • Women: 2.7L/day (from all sources)
  • About 20% comes from food
  • Monitor urine color (pale yellow is ideal)

Reference: Institute of Medicine. (2005). Dietary Reference Intakes for Water, Potassium, Sodium, Chloride, and Sulfate.

Kidney Stone Prevention

Fluid Recommendations

  • Goal: >2.5L urine output per day
  • Typically requires 3L+ fluid intake
  • Water is best, but citrus juices may help for certain stones
  • Avoid sugar-sweetened beverages

Special Considerations

  • Calcium stones: Lemonade may help (citrate content)
  • Uric acid stones: Alkaline fluids preferred
  • Cystine stones: Very high fluid requirements (>4L/day)

Reference: Pearle, M.S., et al. (2014). Journal of Urology, 192(2), 316-324.

Medical References

Evidence-Based References

General Hydration

  • Institute of Medicine. (2005). Dietary Reference Intakes for Water, Potassium, Sodium, Chloride, and Sulfate.
  • Armstrong, L.E. (2005). Hydration assessment techniques. Nutrition Reviews, 63(6), S40-S54.

Pediatric Hydration

  • World Health Organization. (2005). The Treatment of Diarrhoea: A Manual for Physicians.
  • American Academy of Pediatrics. (2019). Pediatric Nutrition Handbook.

Sports Hydration

  • Sawka, M.N., et al. (2007). ACSM Position Stand on Exercise and Fluid Replacement.
  • Thomas, D.T., et al. (2016). Position of the Academy of Nutrition and Dietetics: Nutrition for Athletic Performance.

Kidney Stones

  • Pearle, M.S., et al. (2014). Medical management of kidney stones: AUA guideline.
  • Fink, H.A., et al. (2013). Recurrent nephrolithiasis in adults: Comparative effectiveness.