What is enough to be diagnosed with anorexia?

Criteria for Dx. Dsm-iv-tr: diagnostic criteria for anorexia nervosa includes intense fear of gaining weight, a refusal to maintain body weight above 85% of the expected weight for a given age and height, and three consecutive missed periods and either refusal to admit the seriousness of the weight loss, or undue influence of shape or weight on one's self image, or a disturbed experience in one's shape or weight.