Wellness

Hydration

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Day Streak
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Track how much water you have had against a daily target, so you can see where you actually fall short rather than guessing.

The familiar eight glasses figure has no strong evidential basis. Requirements vary substantially with body size, activity, climate, and diet, and a good deal of daily fluid intake comes from food and other drinks.

How to use it

  1. Set a daily target appropriate to you.
  2. Log drinks through the day as you have them.
  3. Review where you tend to fall behind, which is usually a particular part of the day.

Practical hydration

  • Thirst is a reasonable guide for most healthy adults under normal conditions, though it lags behind actual need during exercise or heat.
  • Urine colour is a more useful indicator than volume consumed. Pale straw suggests adequate hydration; dark yellow suggests more is needed.
  • Tea, coffee, and food all contribute. The idea that caffeinated drinks are net dehydrating is not supported at typical intakes.
  • Keep water within reach. Availability affects intake far more than intention does.
  • Increase intake in hot weather, during exercise, and at altitude, where losses rise substantially.

A note on scope

These are general wellbeing exercises, not medical advice. If you have a health condition, are recovering from injury, or find that an exercise causes pain rather than mild discomfort, speak to a qualified professional rather than working through it.

Frequently asked questions

Do I really need eight glasses of water a day?
The figure is not well supported by evidence. Requirements vary with size, activity, climate, and diet, and a significant share of fluid intake comes from food and other drinks.
Does coffee count toward hydration?
Yes. At typical intakes, caffeinated drinks contribute net fluid. The belief that they are dehydrating overall is not supported by evidence.
How can I tell if I am drinking enough?
Urine colour is the most practical indicator. Pale straw suggests adequate hydration, while consistently dark yellow suggests you need more.