Try switching up your workout! your body gets used to 30 minutes a day, and it's probably too easy for you now! Upping carbs may not be necessary...I run anywhere from an hour to 2 hours a day in addition to weight lifting (training for a marathon) on very little carbs. or try doing some speed workouts. You would be amazed at what an extra 20 minutes on top of your normal workout can do to your bod.