indeed weight loss will be determined by your height, weight and also the extent to which you are exercising, heavier folk will lose more the idea is that they have more to lose thus burning it quicker, when you get lighter or become an ideal weight it tends to stabilize and the body no longer has excess baggage if you will, to remove.
Your diet will play a major factor aswell, staying away from complex carbs will help and also illiminating those goodies such as sweets, crisps, even limiting yoru alcohol intake, try to exercise on an empty stomach this will give your body more chance of burning fat off.
Just a few tips hope it helps, and just remember if your not sweating its not working