People suffering from anorexia nervosa display some characteristics that can be used to diagnose the disorder. Severe anxiety concerning being “fat”, obsessive exercise and/or forceful purging of the body are some of the behavioural aspects. Some of the physical symptoms can include irregular menses, visible damage to hair, nails and skin, constipation, and drop in basal body temperature. In addition to these signs, if a person has a BMI ranging from 16-16.99 kg/m2, they will be diagnosed with moderate anorexia. The severity of the disorder is categorised as inversely proportional to the BMI value.