Calcium2026

Bone mineral density and bone turnover in adolescent girls with anorexia nervosa: a 3-year retrospective cohort study.

Roztoczyńska Dorota, Roztoczyńska Aleksandra, Starzyk Jerzy — Frontiers in endocrinology

Summary

思春期の摂食障害（拒食症）の女子は、特に病気の初期に著しい骨量減少を経験します。この研究は、骨の回復が体重増加だけでなく、正常なホルモンバランスの回復にも依存し、骨の改善には時間がかかることを示唆しています。ホルモン療法とカルシウムおよびビタミンDの補給を組み合わせることで、骨密度に良い影響が見られました。

AI-generated summary — read the original

Key points

思春期の拒食症の女子は、特に病気の初期に大幅な骨量減少を経験します。
骨の回復は、体重増加だけでなく、正常なホルモンレベルの回復も必要とします。
カルシウムとビタミンDの補給を伴うホルモン療法は、骨密度の改善に役立つ可能性があります。
骨の健康改善は、体重回復などの他の回復の兆候よりも遅れることがあります。

What the study looked at

This study aimed to understand how anorexia nervosa affects bone health in adolescent girls over a three-year period, specifically looking at changes in bone density, hormone levels, and other markers related to bone metabolism. Researchers followed 36 adolescent girls diagnosed with anorexia nervosa for up to three years. They annually measured bone mineral density in the spine and assessed various blood markers, including those for bone formation and breakdown, as well as key hormones. The study then analyzed how these factors changed over time and their relationship to treatment. The findings indicated that the most substantial bone loss occurred within the first one to two years of the illness. While some bone density showed partial recovery by three years, this improvement was complex. Treatment that combined hormonal therapy with calcium and vitamin D supplements was associated with a more positive trend in bone density. Crucially, bone recovery appeared to rely on the normalization of endocrine (hormonal) function, not solely on weight restoration, and skeletal improvements often lagged behind other signs of recovery.

Dietary takeaway

This research underscores the vital importance of adequate calcium intake for developing bones, especially for adolescents facing health challenges like anorexia nervosa. Ensuring sufficient calcium and vitamin D through a balanced diet, and potentially supplements under medical supervision, is crucial for supporting bone health. It's important to remember that findings from a single study provide valuable insights but are not definitive and require further research.

Abstract

BACKGROUND: Adolescent girls with anorexia nervosa (AN) are at high risk of reduced bone mineral density (BMD) due to chronic malnutrition, hypogonadism, and endocrine disturbances. Longitudinal studies integrating densitometric, hormonal, and biochemical markers in this population remain limited. OBJECTIVE: To retrospectively evaluate bone metabolism in adolescent girls with AN over a three-year period, including assessment of BMD, bone turnover markers, and hormonal and biochemical parameters. METHODS: Thirty-six adolescent girls with AN were followed for up to three years. Lumbar spine BMD (Z-score) was measured annually by DXA. Bone turnover markers (osteocalcin, CTX), hormonal parameters (estradiol, IGF-1, LH, FSH, cortisol, PTH), and calcium metabolism were assessed. Associations with clinical characteristics and treatment status were analyzed. RESULTS: The greatest BMD loss occurred during the first 12-24 months of illness, with partial recovery at 36 months. Hormonal therapy combined with calcium and vitamin D supplementation was associated with a more favorable BMD trajectory. Higher BMI (used in correlation analyses) was associated with more favorable hormonal profiles (including IGF-1, estradiol and LH), but not with changes in BMD Z-scores. These findings suggest that early skeletal changes may lag behind endocrine recovery during weight restoration. Bone formation markers increased, while bone resorption markers declined. Higher baseline calcium parameters were associated with changes in BMD, potentially reflecting bone resorption. CONCLUSIONS: Bone recovery in adolescent girls with AN depends not only on weight restoration but also on normalization of endocrine function. The effect of nutritional rehabilitation on bone appears to be mediated through hormonal recovery, while skeletal improvement may lag behind. Monitoring bone turnover markers and calcium homeostasis may provide additional clinical insight.

View on PubMed →DOI: 10.3389/fendo.2026.1754392