Actor Mark Wahlberg revealed that he had to eat 11,000 calories per day for his role in Stu. Wahlberg had to gain weight over the course of three weeks to portray a real-life boxer who turned into a priest.

He said that he regretted his choice to gain weight in such a short period of time.

“Unfortunately, I had to consume, for two weeks, 7,000 calories, and then for another two weeks, 11,000 calories,” he told Jimmy Fallon. “And it was fun for about an hour. 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. 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.”

Fallon wished the actor a happy belated birthday, asking him if the weight-gain and weight-loss process was more challenging as a person ages.

“Yeah, absolutely,” Wahlberg replied. “Once the metabolism starts to slow down, it gets really difficult. I was trying to get this movie made for six years, we only had 30 days to shoot it, and so I wanted to really make it happen.

“And [I] was also crazy to have financed a lot of it myself. So I knew I was on a ticking clock on my own dime, and you get things done pretty quickly when that’s the case.”

During the interview, Wahlberg seemed to be back to his familiar physique.

“They want me to do it as healthy as possible,” he said. “I’m like, ‘Dude, I’ve been on such a regimen for so long, I just want to eat everything in sight.’ I want to go to bakeries, I want to go to Denny’s, I want to get pancakes. I want to get everything that I could possibly get my hands on.

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