He is passionate about fitness.But Mark Wahlberg was forced to ditch his healthy habits in order to gain 30 pounds for his upcoming film Father Stu.In an interview with ET Online, Wahlberg revealed he drank glasses of olive oil in order to pack on the pounds. 'Not a lot of fun': Mark Wahlberg revealed he drank glasses of olive oil in order to pack on the pounds'It was a dozen eggs and a dozen pieces of bacon, two baked potatoes, a Porterhouse steak, two bowls of white rice, and a glass of olive oil.