I'd agree with canadjineh. It will take 3 days at least with potential of headaches, fatigue, sluggishness, etc. If I have to cheat on IP (which was once thus far), I cheat with something fatty like a couple slices of bacon or cheese. It has an impact for sure (not recommending as I only lost 1.8 pounds the week I had that one day of cheese), but it didn't throw me out of ketosis and make me feel like crap.
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