What type of eating disorder is characterized by overeating followed by fasting or excessive exercise?

The eating disorder characterized by overeating followed by fasting or excessive exercise is Bulimia Nervosa. Individuals with this disorder typically engage in episodes of binge eating, consuming large amounts of food in a short period of time, and subsequently try to compensate for that by purging (which can include vomiting, excessive exercise, fasting, or the misuse of laxatives).

Anorexia Nervosa is primarily characterized by extreme weight loss due to self-starvation and an intense fear of gaining weight. Binge Eating Disorder involves episodes of binge eating without the subsequent compensatory behaviors seen in Bulimia. Anorexia Athletica is not recognized as a formal diagnosis but refers to individuals who may exhibit excessive exercise patterns similar to those in anorexia but are often focused on performance rather than weight.

Thus, Bulimia Nervosa is the correct answer as it specifically includes the cycle of bingeing and compensatory behavior, which aligns directly with the behaviors described in the question.