Especially so if you go for a fast - no food and all this Sugar available for candida will advantage it and disadvantage you.
Apples are real good, because of the pectin they contain - I eat a green apple a day for that very reason. Granny Smith apples are not that sweet. However you can also get the benefit of the pectin by taking (mallic suplements).
I understand that the fast wants to use apple juice as this will halp your liver cleanse itself. An option would be to take carrot juice insteant.... but then again, when fasting, I would follow the carrot juice by to equivalent quantity of water.