I'm 5'0" and i'm 105 at the moment. I don't believe she's 92lbs in that pic on the right. I look like that at 105 and just a few lbs is a huge difference when you're 5'0" http://www.mybodygallery.com/uploadedPhotos/2000/2520-1.jpg This is 5'0" at 88lbs and very clearly underweight. At this point you might no longer have periods. You're more likely to break bones in a fall as you probably have a calcium deficiency and if you still have periods you are additional risks. There's some additional risks in severe cases like organ failure and shit because your heart and lungs weaken over time. When I was at 103 I still had irregular periods but I was becoming anemic and during particularly heavy periods I would sometimes be unable to stand. Eventually I was medicated (for PCOS surprise surprise) and now my weight fluctuates between 105 and 108 and has for over a decade since I've been medicated. The girl in the post obviously wants to be underweight. She mentions she's struggled with eating disorders and body image. I don't think we should be coming to her defense. But the whales have no right to harp at her either. At this point I would encourage her to keep healthy habits (and it's good she's seeing professional therapy during all this) but I would never ever fucking tell someone to "go eat a cheeseburger" when you can tell in her pics she's is within a healthy weight at the moment.