Well you're BMI at 10st will be 23.3 and a healthy BMI is between 20-25 so i think you'll be fine (as far as these things go) The more important thing would be down to how you feel when you get to 10st, you may be more than happy and decide to stick, or you might feel like another 7lbs is what you want. How about just sticking with your goal of 10st and then just see how you feel when you get closer to it? x