Are you sure about those statistics? I am just wondering because it sounds unhealthy that a 5'9.5" woman weighs less than me: a 158cm/5'2" woman that fits into sizes 0-3 (US/Canada). Well yes I'm actually really sure well not about what 45kg is in pounds but that I weigh 45kg yes since I just weighed myself today.And I fit in 0,too.Now I'm trying to gain weight but it isn't working that well.But my bones aren't heavy at all I actually have like the lightest bones ever.They're not very strong and they break easily so that sucks. Wow you are very skinny. I mean, you and me are the same height and you weigh 10 kg less than me (say 20 lbs) and people say I'm skinny I think you look (weightwise) like my friend; she's tall like us and she weighs approx 100 pounds too, (48 kg) and she's very very thin. But she doesn't look unhealthy bc her bones aren't sticking out. I bet that's the same with you. Yeah,you're right,I quess it's just my bone structure or something because I really don't look unhealthy just weigh really little.So when I tell people how much I weigh they all get freaked out and say that I should gain weight and that I'm unhealthy but I love eating!I love food!Especially all that fattening stuff like pizza,ice cream and all sorts of junk food,but I love eating every type of food I'm not really picky,if it tastes good,I'm satisfied.