Coffee with sweetener: does it break a fast?

It depends

Liquid sweetener adds no calories. Watch out for powdered packets: many use dextrose or maltodextrin as filler, about 2–4 kcal each, small but not zero. Whether the sweet taste triggers hunger is the same open question as with any sweetener.

Approximate energy: ≈2–5 kcal

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General information; not a substitute for a health professional.