Mark Wahlberg chowed down 11,000 calories a day for two straight weeks to transform from a boxer to a priest in the true story of Father Stuart Long in “Stu,” the actor revealed on “The Tonight Show.” And for the two weeks before that, he had 7,000 calories a day — a task that the actor said “was fun for about an hour.”“It’s such a hard, physical thing to do,” Wahlberg said about his weight gain. “Losing weight, you just kind of tough it out, you just don’t eat, and exercise.