Wheatgrass juice fasting

I was wondering if anyone knows anything about wheatgrass fasting.
If i was to drink only 2 or 4 ounces of wheatgrass juice a day, would it have the same or maybe even better effects as water fasting? Or would it be just like juice fasting?
Since it only take a few minutes to digest, would the body go into ketosis like it does when water fasting?

My main problem is my skin (acne, pores, scarring). Any insight is helpful, thanks.