Anorexia Nervosa and Osteoporosis.

Area of Science:

• Endocrinology
• Bone Metabolism
• Eating Disorders

Background:

• Anorexia nervosa (AN) is associated with significantly low bone mineral density (BMD) and elevated fracture risk.
• Low body weight and impaired gonadal function are primary contributors to bone loss in AN.
• Metabolic factors like growth hormone resistance, low IGF-1, low leptin, and hypercortisolemia may also play a role, though causality is not definitively established.

Purpose of the Study:

• To summarize the current understanding of bone mineral deficit in patients with anorexia nervosa.
• To identify key predictors of low BMD and fractures in AN.
• To review potential therapeutic strategies for improving bone health in AN.

Main Methods:

• Literature review of studies investigating bone metabolism in anorexia nervosa.
• Analysis of factors influencing bone mineral density in AN patients.
• Evaluation of evidence for pharmacological interventions.

Main Results:

• Low body weight and hypogonadism are the strongest predictors of low BMD and fractures in AN.
• Weight restoration and the return of menses are the most effective interventions for increasing BMD.
• Bisphosphonates and teriparatide show promise in small trials but lack approval for this specific patient population.

Conclusions:

• Bone loss in AN is multifactorial, with body weight and gonadal function being critical.
• Reversal of malnutrition and restoration of hormonal function are paramount for bone health recovery.
• Further research is needed to establish efficacy and safety of specific treatments for low BMD in AN, especially in adolescents and premenopausal women.