Some actors go through incredible body transformations in order to fill a once in a lifetime role to the best of their ability.
They commit themselves to strict dieting and workout routines in order to look the part, even if it is unnatural to their average size.
Other stars let lavish foods and their hectic schedules get the best of them.
An actor or actress' ability to not only lose weight quickly, but to pack on 20 extra pounds of muscle like it is no big deal; that is what is truly amazing!
The gain weight and lose it in what seems like the blink of an eye; when of course it can be largely attributed to the best trainers and nutritionists that Hollywood has to offer.
Photo by WENN / Facebook / Jennifer Hudson
It takes a whole lot of hard work and dedication to meet the body requirements of some film roles, but this group has gone the extra mile!
A few of these celebrities changed so much I could barely recognize them!
Here are 15 celebrities who have gone through INCREDIBLE body transformations (with not all of them being for good); some for film, and other for personal reasons!
Either way, they are truly incredible!