I was reading through Slimming and WW magazine and it amazes me how different we can all be even at the same height. I am 163cm and at 63.5kg I am as small as I need to be. I am a comfortable size 10 now in jeans. I think I would look too thin if I were any smaller. Some others at 163cm looked good at 57kg or 60kg. I really think we need to suit ourselves and our own body shape and frame size and not be too caught up with numbers. It really all comes down to how comfortable we feel within our body and within our clothes and of course the health benefits.