Christian Bale starved himself for over 4 months prior to filming, eating one can of tuna and an apple each day (approximately 275 calories), as his character needed to look drastically thin. According to the DVD commentary, he lost 62 pounds (28 kg), reducing his body weight to 120 pounds (54.4 kg). Bale wanted to go down to 100 pounds (45.3 kg) but the filmmakers would not let him due to health concerns. He later regained the weight, plus an additional 40 pounds (18 kg) due to weightlifting, in preparation for his role in Christopher Nolan's Batman Begins.