Final answer:
Increased bone density is not a medical complication of weight loss in eating disorders, as weight loss often leads to decreased bone density and increased risk of osteoporosis.
Step-by-step explanation:
The medical complication of weight loss that is not associated with eating disorders is E) Increased bone density. Weight loss in eating disorders such as anorexia nervosa and bulimia nervosa often leads to a decrease in bone density, which can result in osteoporosis. The other options listed—cachexia, loss of cardiac muscle, delayed gastric emptying, and lanugo—are all medical complications commonly associated with weight loss in eating disorders.