Jake Gyllenhaal shocked on the red carpet on Monday night, because he showed off an impressive change.

The actor revealed his new slimmed down self and the 2 day diet pills grown out hair in the 17th Annual Hollywood Film Awards, looking barely recognisable.

The weight looks to become dropping off Jake, who was looking much more like his usual self just a month ago.

The 32-year-old's shocking transformation is perfect for a new role in upcoming thriller 'Nightcrawler', in which he plays a crime journalist reporting on the seedy underbelly of La.

But he is not the very first actor who's lost an impressive zi xiu tang quantity of weight for a role - just check out these lot...

Looking to shed some weight? There's an app for your. Dozens, actually.

Even though many of these apps have cool tech features that are proficient at tracking calories and workout, a new study reveals they are doing little to help individuals overcome common pitfalls just like having not enough time for you to exercise or relapsing into bad consumer habits.

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