Anorexia nervosa and osteoporosis

Area of Science:

• Endocrinology
• Bone Metabolism
• Nutritional Science

Background:

• Anorexia nervosa (AN) is linked to low bone mineral density (BMD) in adults and adolescents.
• Adolescents with AN exhibit decreased bone turnover, unlike adults with AN who show uncoupled bone turnover markers.
• Key factors contributing to low BMD in AN include hormonal deficiencies (estrogen, androgens), malnutrition, reduced lean body mass, and elevated cortisol.

Purpose of the Study:

• To review the pathophysiology of low bone mineral density (BMD) in anorexia nervosa (AN).
• To evaluate the effectiveness of various therapeutic strategies for improving BMD in AN patients.
• To highlight the critical need for effective treatments, especially for adolescents at risk of failing to attain peak bone mass.

Main Methods:

• Review of existing literature on bone metabolism in anorexia nervosa.
• Analysis of studies investigating hormonal, nutritional, and metabolic factors affecting BMD in AN.
• Examination of clinical trial data on anti-resorptive and anabolic therapies for AN-related bone loss.

Main Results:

• Reduced insulin-like growth factor-I (IGF-I) despite elevated growth hormone (GH) creates a GH-resistant state.
• Elevated ghrelin and peptide YY may negatively impact bone metabolism.
• Weight recovery partially improves BMD, with sustained recovery potentially needed for significant gains.

Conclusions:

• Combined anabolic and anti-resorptive therapy (rhIGF-I with oral estrogen) significantly increased BMD in adult women with AN.
• Current anti-resorptive therapies show conflicting results.
• Developing effective therapeutic strategies is crucial for preventing irreversible bone loss and ensuring peak bone mass attainment in adolescents with AN.