If you want to lose body fat in a healthy way, gentle morning jogs (65% max heart rate) for no less than 50-60 mins will do wonders! Your body works aerobically at lower intensities and is able to start using fat stores sooner than if you were working at high intensity.

Another really simple thing to do is switch your eating times around.

Eat the largest meal of the day in the morning and then a smaller meal for lunch, a snack before training (handful of nuts or a banana) and then a small meal consisting mainly of protein but you do actually need to eat some carbs with the protein (bit of brown rice). The carbs allow the body to absorb the protein which is extremely important after a tough session in the gym because of all the muscle fiber damage you've caused (it rebuild them stronger).
Plenty of green tea flushes away toxins built up from lots of training but it also helps the body to burn fat, as does coffee (but try not to have too much coffee, or you'll be dehydrated!!)

Other than that, stay away from saturated fat and as previously mentioned by others, work out how many calories you use in a day (probably about 3000 if you're training), and eat less than that figure!! Simple!