| | Water Fasting

Does zero-calorie energy drink break fasting?

I am asking out of two reasons:

  1. I do not trust there is such a thing as zero-calorie drink
  2. Artificial flavour in zero-calorie energy drink may break fasting

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Answer

Anything that’s not plain green/black tea, black coffee, or unflavored water breaks a fast no matter if there’s zero calories or not. It’s not the calories, it’s the artificial flavors that break the fast by triggering an insulin response.

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