Mark Wahlberg Had to Eat 11,000 Calories a Day for Upcoming Film

Mark Wahlberg is opening up about gaining major weight.

The 50-year-old star made an appearance on The Tonight Show Starring Jimmy Fallon on Thursday night (July 15).

PHOTOS: Check out the latest pics of Mark Wahlberg

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During his appearance, Mark opened up about having to put on pounds to play a boxer-turned-priest in his upcoming movie, Stu, explaining that it was “fun for about an hour.”

“Unfortunately, I had to consume, for two weeks, 7,000 calories, and then for another two weeks, 11,000 calories. It’s such a hard, physical thing to do. Losing weight, you just kind of tough it out, you just don’t eat, and exercise,” he went on to say.

“And this, even when you’re full, I would wake up after a meal and have another meal. I was eating every three hours. It was not fun,” he added.

Check out his weight gain on display from the photos on set of the upcoming movie.