Our bodies are about 60% water. Water is far more than a thirst quencher — it is closely tied to how you feel every day, from regulating body temperature to keeping your brain sharp. This column explains why hydration matters and offers easy guidelines by time of day.
Five reasons hydration matters
The water in your body supports life in many ways.
- Temperature regulation — sweating releases heat and keeps your body temperature stable.
- Nutrient transport — as the main component of blood, water delivers nutrients throughout the body.
- Waste removal — water carries waste out of the body as urine and sweat.
- Blood circulation — staying hydrated helps blood flow smoothly.
- Brain function — even mild dehydration can affect focus and mood.
Keep in mind: by the time you feel thirsty, you may already be mildly dehydrated. Try to drink regularly before you feel thirsty.
How much to drink, by time of day
Sipping small amounts throughout the day works better than drinking a lot at once.
Morning
After waking up, drink one glass (200–300 mL) to replace fluids lost overnight.
Daytime
Aim for about 200 mL every 1–2 hours to help maintain focus.
During exercise
- Before exercise: 200–300 mL
- During exercise: 100–200 mL every 15–20 minutes
- After exercise: 300–500 mL
Evening
About 1–2 hours before bed, drink 100–200 mL — and avoid overdrinking right before sleep.
Signs you may need water
If you notice any of these signs, you may not be drinking enough.
- Headache
- Fatigue
- Dizziness
- Dark-colored urine
A tip from Water Coach
Hydration works best when you sip small amounts consistently rather than drinking a lot at once. Build simple cues into your day: after waking up, around meals, before and after going out, and after bathing.
Water Coach supports exactly this kind of habit — with one-tap logging, a goal that fits you, and gentle reminders.