A change of diet to a healthy one and also an appropriate exercise plan out could do. The first thing that you should however do before this is set your mind to it. Other people prefer taking pills but medical research shows that this could have negative side effects.
That's rather extreme, I guess you will be very hungry for the next two weeks. Maybe you should load up on trail mix and get your best walking shoes and start walking for two weeks straight, making infrequent stops. Oh ya, drink lots of water.