What a great way to start a fast--wish I could do one of those!
Fasting during a liver flush is different than just fasting alone since you have to drink that large amount of olive oil in one go and down all those epsom salt drinks which can be pretty taxing on your system. If your diet was not clean, especially on the day of the flush, you can get pretty nauseous so your liver flush experience should not be used as a guideline to say that you will feel ill by the 2nd day of a juice fast.