The best time to drink fluids is before dehydration occurs. People lose water and electrolytes during illness through fever, vomiting, and diarrhea. Exercise, hot and humid weather, or physical labor prompt sweating. Injuries leading to blood loss are unexpected and unpredictable, but most can still avoid dehydration and electrolyte imbalances. Make sure to drink extra fluids during illness, strenuous activity, or hot weather.
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