You have to figure out your caloric maintence level. Meaning the amount of calories you can take in a day for bodily needs to where you dont gain or lose any weight. TO do this you need to count every calorie you put in your mouth. If your weight stays the same for a week (or 2 ) thats your caloric maintence need. THen you subtract 500 calories a day. Can add weight training high intensity and cardio 3-4x a week to see faster results. Basically just a numbers game.