50 pounds in 2 months

I am hoping that I will be able to lose around 50 pounds in 2 months I will do the 2 shakes and a chicken salad for around 3 weeks. I hope to lose around 19 pounds with this diet. So, my starting weight is around 164.4 pounds that would bring me down to around 145.4 pounds. If I follow that plan exactly and do exercise I should be able to lose the 19 pounds I need to. If I lose at least 19 pounds on this diet I will probably switch to alternate fasting, but we will see once 3 weeks is up :)