Can I drink water while fasting?

Last reviewed · Jun 29, 2026 · Not medical advice
Quick answer

Yes. Water is usually allowed and encouraged during intermittent fasting.

Step by step

01 Drink water before hunger gets intense.
02 Keep a bottle visible.
03 Use urine color and thirst as rough hydration cues.

The longer answer

Water does not add calories and can reduce fasting side effects related to dehydration. Some religious or medical fasts may have different rules, so follow the specific instruction for that fast.

Tip

A pinch of routine beats heroic willpower: hydration makes fasting feel less dramatic.

Common mistake

Waiting until you are already dizzy or headachy to drink water.

Track in the app

Track the drink or first meal, fasting duration, hunger, energy, and whether you completed the planned fast.

Safety note
Educational only. People who are pregnant, breastfeeding, under 18, have diabetes, take glucose-affecting medication, have a history of eating disorders, or feel unwell should speak with a qualified clinician before fasting.

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