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Can a Berachah be made LeVatalah retroactively?

What if you eat something that is spoiled, not realizing it until a bite or two in? You would not make a Berachah on spoiled food. But if you did, and you ate it, and then you realized it was spoiled, does your Berachah retroactively become in vain? Would it make a difference if you had either an extreme reaction or a neutral reaction?

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similar to judaism.stackexchange.com/questions/17077/… – Gershon Gold Aug 27 '12 at 18:22
A similar case would be if you say Hamapil and can't fall asleep – b a Aug 27 '12 at 18:30
May nafka minah if it's l'vatala? – msh210 Aug 27 '12 at 18:33
@msh210 If you have to do teshuvah – b a Aug 27 '12 at 18:43
@ba Nesivos 234:3. I'm guessing not all agree, but it is a known and serious opinion. – Double AA Aug 27 '12 at 21:48

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