Answer: Because calorie starving your body, starves it of sufficient nutrients as well, and puts it into fat storage mode (and tends to burn away your lean healthy muscle in the process, further killing your metabolism and increasing fat gains).
If you properly exercise each muscle group twice weekly, you will find that your metabolism ramps up significantly (healthy muscles are our strongest calorie burners 24-7). Than means you can eat plenty of HEALTHY calories GUILT FREE, give yourself plenty of nutrients to keep the healthy cycle going, & still lose weight in the process. That's how you lose weight in a healthy manner and achieve a low fat to muscle ratio for a lean, toned body. answers.yahoo.com