You've worked hard and you've lost a significant amount of weight. Your metabolic rate may drop below what your ean body mass would suggest; hence s slow metabolism. Meaning you will burn fewer calories at rest and during activity and therefore have to eat less to avoid becoming overweight. In about 6 months, your metabolic rate should rise back up to where it should be, but during that time, it can be very easy to regain weight and undermine all of your hard work. It is very important to test your metabolic rate frequently with an RMR test during this critical time to know just what your target calories are to keep you on track!