You are only eating between 700-950 calories per day. Your body needs those calories to operate your body at rest. If you exercise at a level Beyond light activity/exercise, your body will be forced get the additional fuel it needs by feeding on your lean muscle mass. We do not want to lose muscle. After the first 3 weeks of adjustment, you can add in lighter exercise. Drink BCAAs during your activity. If you will burn 200-300 calories, add an extra unrestricted within 30 mins of working out. If you will burn 300+ activities you can switch to the IP Plan for athletes which adds one grain, one fruit and one dairy per day. You will need the added carbs to fuel your workouts.