Zlatan Ibrahimović is 32 and he doesn't strike me as someone with a slow metabolism <lol>. You can't target fat loss, but if your belly is the only place where you have it, then your body won't have to spend too much time deciding where to take it from. You want to spend long enough periods of time in your fat burning zone. Jogging may put you in the aerobic zone, where you burn less fat and more carbs. Here you can see a 9.7 km run (60 minutes, average heart rate:135 bpm): and here the same distance, but walking (80 minutes, average heart rate: 117 bpm): As you can see, same distance, but I spent 58 minutes in the fat burning zone when walking, against only 10 minutes when running. So from a fat burning point of view, (brisk) walking is more efficient than running. A heart rate monitor can be useful if you're not sure about the HR zones you're exercising in. The above graphs and data are from the Runtastic app, which I use on my Nexus 4 phone and in connection with my Mio Alpha HRM.
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