Did you happen to catch a very fit Mark Wahlberg in the new "Transformers: Age of Extinction" trailer from earlier this week? Yeah, he doesn't look like that anymore. 

The 42-year-old has revealed he lost 61 pounds to play the role of a literary professor with addiction issues in the upcoming film "The Gambler." 

"I started at 196 and got down to 135... I began with a liquid diet," he told People. "Then I completely changed my training program and gave up wine, bread and pasta. Now I'm eating small portions of protein throughout the day and jumping rope a lot."

Back in January, Wahlberg revealed to "Extra" that he started the crash diet just after completing "Transformers" with a goal of getting "as thin as possible." Unfortunately, the drastic change in his eating habits made him irritable and ravenous. 

"Anytime I smell food, I get crazy," he told "Extra's" Maria Menounos. "My daughter was eating this blueberry scone, and I wanted to like — I was going to jack her for it. I was literally going to rob my almost 4-year-old daughter for her little blueberry muffin."

Wahlberg's weight loss comes as more male celebrities embrace drastic diets for roles — including Matthew McConaughey, who lost more than 40 pounds (and nearly went blind) for his Oscar-winning performance in "Dallas Buyer's Club."

"It was tough-going, I'm not going to lie," McConaughey said. "The dieting was pretty hard-core. I was losing seven pounds every week. I'd have a Diet Coke, two egg whites in the morning, a piece of chicken, then another Diet Coke. That was rough. I got down to [143 pounds] and I was always hungry, and irritable."

"My body resembled a baby bird with its mouth open, crying, ‘Feed me, feed me,’ and you realize momma bird ain’t going to feed you. It’s hard.”

"The Gambler" is expected to premiere sometime in 2015.

Mark Wahlberg

Related on MNN: 

The opinions expressed by MNN Bloggers and those providing comments are theirs alone, and do not reflect the opinions of MNN.com. While we have reviewed their content to make sure it complies with our Terms and Conditions, MNN is not responsible for the accuracy of any of their information.