Fluid intake is the foundation of stone prevention, but advice to drink a set number of glasses ignores climate, work and sweat losses. A target for urine output, commonly at least 2 to 2.5 litres a day, adjusts automatically for heat and exertion.
In hot climates or outdoor work, intake may need to be well above 3 litres to reach that output. Pale urine through the day is a practical check.
- Set a urine output target of at least 2 to 2.5 litres a day.
- Increase intake in hot weather and with outdoor work.
- Use pale urine through the day as a practical check.
- Spread intake across the day, including before bed.
Why it matters
A fixed number of glasses falls short in an Indian summer.
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