| | Water Fasting

Got a paper cut on my finger and I drank a drop of blood from sucking my finger

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Answer

First of all if your fasting your blood sugar will be relatively low. Secondly, the sugar content will be so low in a single drop of blood, from a person in a fasted state, that if you measured it, you would get away saying there is zero sugar present as it will just be too insignificant a number. Forget about it. Sucking a drop of blood would not break your fast.