I did the equivalent of this when traveling and I left my IP packet at the hotel. I stopped and bought a Pure Protein bar, which is the equivalent of a restricted. I had already had ridges on the train... so basically had two restricted...
I did it one day, and it didn't impact my loss for the week. If you are in a sticky situation, doing this is probably better than an out-and-out cheat. However, like Jordana said, it might kick you out of ketosis. People have varying degrees of sensitivity to carbs, and some get kicked out more easily than others.
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