You simply need to just figure out roughly how many calories you are eating a day and then reduce it while doing some sort of cardio. You need carbs for energy, the best way to do this is to eat them at times when you require energy so you burn them. If you eat a shit load of carbs all the time then it gets stored and turned into fat. Carbs are not bad as long as you use them the right way. So you shouldnt really forget carbs and just eat protein, you need to include both in your diet. Cutting weight is mostly diet, if you were to do hectic cardio every day and eat nothing but shit you would get no results. Losing weight in an unhealthy matter like water weight, starving or any other stupid way then you will most likely not maintain it. Cut the shit food out, no soft drinks...AT ALL, no chocolate...no alcohol, eat some salads, steak, breast chicken,tuna,fruit...all common sense really. Oh and pizza is the kind of thing that could ruin all the hard work you do in a week in one night