All the answers are correct.
Many people who struggle with eating disorders usually also experience depression, anxiety, obsessive disorders and other mental illnesses. Physical health is also greatly affected as those with eating disorders do not receive the necessary nutrients needed for growth. Heart, hormonal and digestive issues may also follow suit due to low calorie count, lack of nutrients, vomiting and food restrictions. Food also fuels our brain, so lack of sleep, problems with concentration and dizziness/ fainting are also possible occurrences.
Because of all of these physical and mental consequences, eating disorders are extremely life threatening if not treated.
Anorexia, Bulimia and other eating disorders can be considered chronic illnesses as, by definition, they can be long-lasting if the right help is not available. Chronic illnesses are often labeled that if the illness lasts longer than 3 months. By that definition, eating disorders can develop into chronic illnesses.