Actress Lee Si Young's true body proportions has recently been garnering much interest. On the 29th, her entertainment company stated that the actress's weight was 48 kg, with a body fat of only 4.7 kg. The average body fat for women is usually between 12~18 kg, and you would have to be a professional athlete to have a body fat value like Lee Si Young's. During the press conference of drama 'Playful Kiss', Lee Si Young revealed, "I went on a boxing workout diet and lost 7 kg." However a representative recently revealed that not only did she lost weight from boxing, she also underwent a dietary treatment to maintain her low body fat. The representative also said, "As soon as she was cast for 'Playful Kiss', she began to play tennis and other sports to slim down." Source + Photo: MoneyToday