Anorexic BMI Calculator
Low BMI or body weight is just one physical feature for anorexia. Not all low BMI or body weight is related to anorexia. More information about anorexia is available at http://en.wikipedia.org/wiki/Anorexic.
Reference1. CDC weight chart for boy between age 2 and 20
2. CDC weight chart for girl between age 2 and 20