Have you always wondered how celebrities are able to fatten up and then slim down in no time for roles? Like how Beyonce was able to trim 20 pounds off in order to play her sexy role in the film Dreamgirls? Or how Jared Leto was able to put on 62 pounds for a role in Mark David Chapman and then lose all of that in no time? You may think that it has something to do with the personal chefs and trainers but in this case, it doesnt at all.