How do you loose 60 pounds in 3 months?

First of all I would like to say it's unhealthy to lose 60 pounds of weight in a short period of time. There are some extreme weight lose methods to lose huge amount in fewer days. One of those methods is cabbage soup diet, in this diet a person might lose 10 pounds in a week but it might be instant weight loss. In cabbage soup diet some particular period of time the person has to consume only the foods which made by cabbage. Take any nutritionist's suggestion to know some more about this diet.