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Is there any reason someone would refrain from eating on the day of conversion up until it is complete?

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If someone ate while a non-Jew and then converted immediately afterwards, there may be a shailah as to whether he must say an after beracha. – Clint Eastwood Jul 7 '14 at 21:53
that's another interesting point but not what my question is about. If someone were to be going through a gerus they are starting a new life. Another event would be marriage in which a couple are starting a new life together and fast up until the chuppah is complete. – yid Jul 8 '14 at 1:26
It sounds like a logical comparison and basically answers your own question. Whilst there may be no compulsion or custom to fast, I see no reason why a person shouldn't fast voluntarily if he feels it's appropriate. – Epicentre Jul 8 '14 at 4:43

Tshuvos Vhanhogos 2:506 in the name of Seridai Aish 2:108 says that there are some when converting that fast on the day of immersion. However Tshuvos Vhanhogos says that a convert should only fast up until the immersion, as after that it is a Yom Tov for him and it is inappropriate to fast then. The reason is that similar to a groom who fasts on the day of his wedding as his sins are forgiven.

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That doesn't seem to be true though judaism.stackexchange.com/q/6429/759 – Double AA Jul 8 '14 at 14:56
@DoubleAA: Interesting. Perhaps that is why not all do so, as he clearly says that there are "some". – Gershon Gold Jul 8 '14 at 14:57

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