Stop the misinformation of the long, steady-state cardio conspiracy. The undeniably best way to get fit is by doing intervals. Read this.
http://www.avantlabs.com/page.php?pageID=274&issueID=30
It explains the science behind sprinting for ideal body composition. Also, fast food and sugary drinks will kill your goal (I'm a bit partial to alcohol, so I won't rag on it). Eat better and add a couple interval (sprint) workouts to your week. You'll be surprised.