Mark Wahlberg 60 Pound Weight loss, Most He's Ever Lost For a Film: "The Gambler" Star Reveals How He Did It.

The world knows Mark Wahlberg as the ripped action stud in movies like The Fighter and Lone Survivor However, in his new movie The Gambler the star reveals how he had to loose 60 pounds to play a college literary professor.

"I appreciate when I have an opportunity like this so there isn't anything that I wouldn't do to prepare, whether it be mentally or physically," the star told PEOPLE. "A liquid diet for six weeks. Jumping rope. Not eating. Being miserable."

The life of an actor is harder than we could've ever pictured!

As Mstars News previously reported the Transformers 4: Age of Extinction hunk said losing the weight was much harder then expected. Also, convincing audience viewers that he could portray a teacher was just as hard.

"I mean, that's what the job requires. That's what you're supposed to do and I welcome those things with open arms. And I usually get a little obsessive," he told People.

He told Men's Fitness in an interview that to loose weight for his roles in movies like The Fighter he focused mostly on cardio, playing 5:30 a.m. basketball games.

"My goal really was to get a pound thinner that I got in Boogie Nights, which was at 25 so it was a lot easier then than doing it at 42," adding "I was more focused on understanding the words that I had to speak in the classroom. Being able to believe in myself going out there and saying those words and feeling confident."

 Mark's mom's favorite movie of his is "Boogie Nights" (1997). What's yours?

A photo posted by Mark Wahlberg (@markwahlberg) on Oct 10, 2013 at 1:58pm PDT

The 1997 drama film Boogie Nights put Wahlberg on the map as he played a young nightclub dishwasher Eddie Adam, who became popular pornstar 'Dirk Diggler' during the golden age of the '70s porn industry.