Do some forum searching and you'll see this has been discussed many times before. The main driver of fat/weight loss is your food intake. If you're quite overweight, you can and will lose a bunch of bodyfat just doing the program and eating intelligently, especially if you've been sedentary till now. Each case varies because it depends how much weight you have to lose and what you were both eating and doing exercise-wise beforehand.
Since you're new here, read the sticky before posting again and then search the forum for any of the dozens (hundreds?) of times this has been discussed here before. If you still have Qs or need clarifications after that, come back and let's talk.