The two types of anorexia are restricting type and binge-eating/purging type. In the restricting type of anorexia, a person severely limits their intake of food. They may obsessively count calories, skip meals, or cut entire food groups out of their diets, which can result in serious nutritional deficiencies. With the binge-eating/purging type of anorexia, a person may eat large amounts of food and then induce vomiting, or misuse laxatives or diuretics, which can lead to organ damage in the long term.
Those with either type of anorexia often have underlying issues related to body image or mental illness, and should always be treated by a doctor or mental health professional.