Listen to your body

Most healthy adults can simply drink to thirst and check that their urine is pale yellow most of the day.

When you need more

  • Hot or humid weather.
  • Exercise lasting over an hour.
  • Higher protein or higher fiber intake.
  • Illness with fever, vomiting or diarrhea.

Electrolytes matter too

Water without sodium, potassium and magnesium can leave you feeling worse, especially after sweat-heavy workouts.