Carrot juice is about 80-100 calories per 8ozs. serving.Depending on how much your juicing,plus your normal caloric intake.You may need to adjust your diet accordingly.Carrot juice is high on the glycimic index.So one should use sparingly to enhance the greens.I have a greenstar2000! and love it!!An awsome juicer,have you tried wheatgrass yet?After you juice for a while the greens taste better,try parsly a vibrant but not harsh taste.Good luck and happy juicing!!