Anorexia Nervosa, psychology assignment help

Define the major characteristics of eating disorders such as: Anorexia Nervosa, Bulimia Nervosa, Binge Eating Disorder, Rumination Disorder, Pica and Feeding Disorder. Which of these disorders do you believe to be most serious, explain our answer.

Answer your question thoroughly and cite one outside source (your textbook, on-line resources, journals, etc)