Osteoporosis, or porous bone, is a disease characterized by low bone mass and structural deterioration of bone tissue, leading to bone fragility and an increased susceptibility to fractures, especially of the hip, spine and wrist, although any bone can be affected. Osteoporosis is a serious and sometimes irreversible medical consequence of anorexia and bulimia. The longer an adolescent suffers from an eating disorder the greater the potential of long-term bone deficiency. Contributing factors include: Amenorrhea, low body weight, inadequate dietary calcium, diminished body fat and elevated serum cortisol levels from weight loss.