Preparing for a Juice Fast. Can I lose 2.3 stone?

I am preparing for a juice fast. I am taking two weeks to prepare as I need to come off anti-depression medication slowly. I believe I am low on iron supplies. Currently I am taking iron tablets from the health food shop and increasing my iron intake. Now is just a time to prepare myself mentally. I am buying a diary, joining this site and stocking up on all supplies ie, flax-seeds and juicers etc. I am 11 stone ( approx) and 5.7ft height. I would love to be 8.7 stone. Would it be safe and possible to juice fast until I reach this goal?