is it ok to fast on day of liver cleanse

I saw your response to a post below that fasting makes your digestion "sleepy" and you have to wake it up again before doing the liver flush, but this person was going to be fasting for 10 days. Is it ok to fast for just the day of the flush, or will drinking the oo/juice after that make me sick? I saw an archived post from someone who said that if he didn't eat anything the day of the flush, he didn't have the nausea that he usually had. What are your thoughts on this?