Portion control only works if it's healthy portions. You can't eat small amounts of KFC during the day and be healthy. Again it's simple: stop consuming sugar. Your body can't process it, and stores it to fat asap. This isn't difficult - kill the soft drinks and ice cream and frappacinos and life will drastically improve.
Your diet is probably 2-3x as important as your exercise regimen is in dtermining fat. It's your choice: eat healthier or work out a ton to compensate. Really, which is easier?