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What are you supposed to do if you inadvertently broke your fast*? Do you:

  1. keep going;
  2. extend it (if so, how long);
  3. cancel it (if so, do you make it up a different day)?

*This question is for day-fasts only.

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Someone downvoted the question and answer today. Why? – Double AA Apr 23 '14 at 22:24
up vote 29 down vote accepted

The Mishna Brura OC 549 sk 3 says to continue fasting if you accidentally ate.

In OC 568 sk 3 he says you can still say Aneinu at Mincha if it is a public fast day (as opposed to a personal one).

In OC 568 sk 8 he says that you do not need to fast again on a different day for accidental eating on the public fasts as well as any personal fast that has a fixed date (eg Yahrtzeit).

This halacha is not limited to Yom Kippur and Tish'a b'Av, but applies to "minor" fasts, as well.

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You should clarify that this is only for the particular case of the question (inadvertent) and, on minor fasts, not in the case of someone who had to eat for medical reasons. – A L May 27 '13 at 2:32
@AL I'm not so sure that is necessary; the context is pretty clear and I do say "if you accidentally ate". You can always suggest an edit if you want. – Double AA May 27 '13 at 2:34

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