there are a few other factors that go into weight loss besides just eating and exercising. genetics is a big thing. but from what youre saying, 5 lbs a month might be less than you'll actually lose, at least for the first months. then you might plateau off and find it more difficult to lose stuff afterwards. i think you could lose 20lbs w/in 2 months, but im not tryin to raise your hopes too high. good luck though.