hi ya , r u a girl or boy , coz its different . if your a girl then youll lose it in your periods and stuff , but if your a boy and your eatin rite youll just grow into it , i ahd a m8 (boy) who was 200llb when he was 13 hes now 15 and is only 150llb but he didnt change his eating habits or exercise more he just grew taller! hope this helpped !!