Daily Fluid Needs
The NHMRC recommends approximately 2.6 L/day for adult men and 2.1 L/day for adult women from all sources. In hot conditions or during exercise, needs increase substantially.
Monitor urine colour as a practical check — pale straw suggests adequate hydration.
Exercise Hydration Protocol
| Timing | Amount | Notes |
|---|---|---|
| 2–3 h before | 400–600 mL | Allows absorption before session |
| During (<60 min) | 150–250 mL / 15–20 min | Water sufficient |
| During (>60 min) | As above + electrolytes | Sodium aids fluid retention |
| Post-exercise | 1.25–1.5 L per kg lost | Covers ongoing losses |
Electrolytes
Sodium, potassium, magnesium and calcium are lost through sweat. A balanced diet usually covers daily needs. For prolonged exercise in heat, try: 500 mL water, ¼ tsp salt, squeeze of citrus — a practical alternative to sugary sports drinks.
Caffeine & Hydration
Moderate coffee and tea (3–4 cups/day) contribute to daily fluid intake. Habitual consumers develop tolerance to caffeine's mild diuretic effect, resulting in minimal net fluid loss.
Australian Heat Considerations
Australia's climate varies widely but many regions experience extreme summer heat. Drink proactively before thirst arises — thirst can lag behind actual fluid deficit by 1–2% of body weight, which may already impair physical performance. Heat acclimatisation over 10–14 days improves thermoregulatory efficiency.