Does zero-sugar energy drink break a fast?

Q: Does zero-sugar energy drink break a fast?

Maybe - use caution. Usually calorie-light, stimulant-heavy. Calories may be fine; the bigger fasting problem is stimulant load and sweet taste. Use sparingly, avoid late-day caffeine, and stop if it makes fasting feel harder.

/ 100

Use caution

Usually calorie-light, stimulant-heavy

0-15 kcal

Maybe - use cautionmedium confidenceBehavioral fasting signal

Decision

Maybe - use caution. Zero-sugar energy drinks usually do not add meaningful calories, but caffeine and sweeteners can affect appetite, sleep, and jitters.

Reason

Calories may be fine; the bigger fasting problem is stimulant load and sweet taste.

Evidence

Nutrition labels can confirm calories and sugar, while supplement-style caffeine blends vary widely by product.

How we calculate this value

Base tier: 60/100 for "Use caution". Item adjustment: -2 points for calories, nutrient signal, product variability, and safety caution. Final Fast Score: 58/100.

What to do

Use sparingly, avoid late-day caffeine, and stop if it makes fasting feel harder.

Medical caution

Avoid high-caffeine products if your clinician limits caffeine or stimulants.

References for this answer

Methodology

U.S. Food and Drug Administration: Added Sugars on the Nutrition Facts Label MedlinePlus, National Library of Medicine: Taking multiple medicines safely