Actors and actresses who went to insane lengths to transform themselves.

15. Jake Gyllenhaal looked gaunt after losing 30 pounds for his role in “Nightcrawler”rnrnGyllenhaal went the extra-mile to get into the mindset of his deranged, career-hungry freelance journalist. Instead of going on some sort of special diet, Jake ran 15 miles from his home to the set and stopped eating altogether.rn“I would try to eat as few calories as possible. I knew if I was hungry that I was in the right spot. Physically, it showed itself, but chemically and mentally, I think it was even a more fascinating journey. It became a struggle for me.”