Hi I would certainly not recommend you going on an exclusive shake diet. You are losing out on the vital antioxidants in this type of dietary regime. Antioxidants as we all know are essential in maintaining our immunity apart from carrying out several other important physiological functions. Advice you to get a customized diet chart for your self and with correct advice, determination and control you can achieve the new look in no time.... All the very best for the future. Please feel free to ask anything further in this regards.