I gained 4 pounds of pure muscle and lost fat in only 40 days in Thailand by exercising and eating mostly fruits. Note: After Thailand I flew to the dry Arizona desert and after 17 days of desert life I still weighed 4 pounds more. See the short video at : 

http://thecoolvegetarian.com/blog/2011/02/how-i-gained-4-pounds-of-muscle-in-40-days-eating-fruit-video/