Final answer:
Anxiety is the most common coexisting mental health issue with anorexia and bulimia, and those affected by these eating disorders need comprehensive treatment for both physical and psychological health.
Step-by-step explanation:
The most common coexisting mental health issue associated with anorexia and bulimia is anxiety. Individuals with anorexia nervosa and bulimia nervosa often experience significant negative health outcomes, including potential mental health issues.
Anxiety disorders, mood disorders, and substance abuse are among the psychological problems that those with eating disorders may face. While there are other mental health issues that can coexist with eating disorders, such as depression and panic attacks, anxiety is particularly common. It is crucial for individuals with eating disorders to receive comprehensive treatment, addressing both the physical and psychological aspects.