I am also 5'9 and once got down to 12st 4 - I was slim even if I did still have a BMI at 26! I'd lost 4 stone and was strutting it in a bikini on hols, flat stomach but still curvy 10-12/14 size. I then went to the doctors for the first time in ages and told him what I'd done - his answer was "well your still overweight". This really got to me and next time I've learned I'll stop at the weight that suits me, not some stupid medical chart!