血清の副甲状腺ホルモン濃度,ビタミンD不足,およびカルシウム摂取量の関係
Laufey Steingrimsdottir1, Orvar Gunnarsson, Olafur S Indridason
1Public Health Institute of Iceland.
JAMA
|November 10, 2005
まとめ
適切なビタミンDレベルは,カルシウムバランスのために不可欠であり,高カルシウム摂取を不必要にすることがあります. ビタミンDサプリメントは,北部の気候の個人が十分なビタミンD状態を維持するために不可欠です.
科学分野:
- 栄養科学とは,栄養科学である.
- エンドクリノロジー エンドクリノロジー
- 骨の健康 骨の健康とは
背景:
- 骨の健康のために最適なビタミンD状態がますます認識されていますが,理想的な摂取量は定義されていません.
- 血清25-ヒドロキシビタミンDは,ビタミンD状態の標準バイオマーカーですが,普遍的な基準範囲は欠けている.
研究 の 目的:
- 高カルシウム摂取量と血清25-ヒドロキシビタミンD濃度のカルシウムホメオスタシスに対する比較的重要性を評価する.
- カルシウム摂取量,ビタミンD状態,および血清の不変副甲状腺ホルモン (PTH) レベルとの関係を決定する.
主な方法:
- 3つの年齢層 (30~45,50~65,70~85歳) の2310人の健康なアイスランド人成人を対象とした横断的な研究.
- カルシウムとビタミンDの食事摂取量は,食事頻度アンケートを使用して評価されました.
- 参加者は,カルシウム摂取量 (<800 mg/d, 800-1200 mg/d, >1200 mg/d) と血清25-ヒドロキシビタミンD濃度 (<10 ng/mL, 10-18 ng/mL, >18 ng/mL) に基づいて分類された.
主要な成果:
- 血清PTH濃度は,血清25-ヒドロキシビタミンD>18ng/mLを有する個体で最も低く,血清25-ヒドロキシビタミンD>10ng/mLを有する個体で最も高い.
- 低ビタミンD (<10ng/mL) の個体では,カルシウム摂取量<800 mg/dは,血清PTHの上昇と関連しており,これは>1200 mg/d (P=.04) と比較されています.
- カルシウム摂取量>1200 mg/dでは,ビタミンDの摂取量が最も低いグループと最も高いグループ (P=.04) の間で血清PTHの有意な差異が観察されました.
結論:
- 十分なビタミンDの状態は,カルシウム代謝のために1日800mgを超えるカルシウム摂取の必要性を否定する可能性があります.
- 適切なビタミンD状態を達成するために,特に北緯度ではビタミンDのサプリメントを推奨されます.
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