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Does water break a fast?
100
/ 100
Fast-safe
Okay during a clean fast
0 kcal
Yes - fasting-safehigh confidenceClean-fasting principle
Decision
Yes - fasting-safe. Plain water keeps the fast intact and helps with headaches, appetite waves, and dry mouth.
Reason
Plain water keeps the fast intact and helps with headaches, appetite waves, and dry mouth.
Evidence
Plain water has zero calories and no effect on insulin or autophagy — the cleanest possible fasting fluid.
How we calculate this value
Base tier: 92/100 for "Fast-safe". Item adjustment: +8 points for calories, nutrient signal, product variability, and safety caution. Final Fast Score: 100/100.
What to do
Use this as the default choice during fasting hours.
References for this answer
MethodologyRelated reading
What breaks a fast?
More “fast-safe”
The Fast Score is an editorial estimate of clean-fast strictness, not medical advice. Goals vary — if you fast for glucose, appetite, or medical reasons, follow your clinician.