Água durante jejum
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
2-3L conforme duração
About this calculator
The 'Water during fasting' calculator helps determine the ideal daily water intake during intermittent fasting. The recommendation ranges from 2 to 3 liters, depending on the fasting duration and individual needs. It emphasizes hydration as crucial for bodily functions even without food intake.
The formula is based on nutritional studies suggesting 1 to 1.5 liters of water per 12 hours of fasting. For example, 16-hour fasts suggest 2 liters; 24-hour fasts recommend up to 3 liters. The calculation automatically adjusts based on the fasting duration provided by the user.
Use this tool when starting intermittent fasting or adjusting hydration during extended fasts. It helps prevent dehydration and maintain electrolyte balance. Not a substitute for professional medical advice, especially for long fasts or specific health conditions.
Precautions: Do not exceed water intake without medical supervision, as it can cause hyponatremia (low sodium levels). Avoid adding sugar or artificial sweeteners to drinks during fasting. Adjust according to weather, physical activity, and fluid loss through sweat.
Frequently asked questions
What is the minimum and maximum water range recommended?
The recommendation ranges from 2 to 3 liters per day, depending on fasting duration and physical activity.
Does the calculator consider physical activity level?
No, it uses only fasting duration. Physical activity increases hydration needs, so adjust manually if applicable.
Can I drink tea or coffee during fasting?
Yes, but avoid adding sugar. Caffeinated drinks may increase water requirements.
What to do if I feel constant thirst?
Excessive thirst may indicate dehydration. Consider electrolyte replacement with salt or balanced solutions.