[Osteoporosis in anorexia nervosa]

Area of Science:

• Endocrinology and Bone Metabolism
• Nutritional Psychiatry
• Osteoporosis Research

Background:

• Anorexia nervosa (AN) is linked to early and significant bone mineral density (BMD) loss, affecting cortical and trabecular bone.
• BMD reduction in AN correlates with age, anorexia duration, and associated amenorrhea, with factors like low weight and hormonal imbalances contributing.
• Fractures in AN patients resemble post-menopausal osteoporosis, including vertebral, rib, hip, forearm, and pelvic fractures, sometimes occurring without weight loss.

Discussion:

• The mechanism of bone loss in AN mirrors post-menopausal osteoporosis but is exacerbated by factors like alcohol and drug abuse.
• Amenorrhea in AN may share mechanisms with that in female athletes, suggesting a link between high-performance sports and bone health.
• While hormone replacement is a primary treatment, patient refusal of medication, especially oral contraceptives, complicates management and psychiatric care.

Key Insights:

• Bone mineral content can decrease by 6-8% in 90% of AN patients, impacting bone health early.
• Osteoporotic changes are often reversible with anorexia recovery, with BMD returning to normal in cured individuals.
• Severe, long-term AN can lead to chronic bone loss and irreversible damage, even after recovery.

Outlook:

• Estrogen therapy can re-establish menstruation but may not fully restore BMD; combined progesterone-estrogen with fluorine shows promise.
• While sports can benefit bone health, excessive exercise in AN may paradoxically increase bone loss.
• Future research should focus on integrated psychiatric and medical interventions, considering patient preferences regarding medication for optimal bone health outcomes.