Why should patients with hypercholesterolemia consume natto?

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Last updated: September 27, 2026 • View editorial policy

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納豆對高膽固醇的效果極為有限,不應作為主要治療方式

根據最高品質的證據,納豆及其成分(納豆激酶)對降低膽固醇的效果微弱且不一致,不應被推薦為高膽固醇患者的主要治療選擇。

證據分析

大豆蛋白與異黃酮的效果

美國心臟協會2006年的權威指引1111明確指出:

  • 大豆蛋白的降膽固醇效果極小: 即使每天攝取50-55克大豆蛋白(遠超一般飲食量),LDL膽固醇僅下降1-2%
  • 異黃酮無效: 19項研究的加權平均顯示,異黃酮對LDL膽固醇的影響為0%,完全無效
  • 無劑量效應: 增加攝取量並不會增強降膽固醇效果

納豆特定研究的矛盾結果

雖然有研究顯示納豆可能有益,但證據質量參差不齊:

  • 2026年研究2: 納豆紅麴補充劑(NRYR)使LDL-C下降21.02 mg/dL(-13.21%),但這是複方製劑,含有紅麴成分(本身就是他汀類似物),無法單獨歸功於納豆
  • 2023年研究3: 納豆-紅麴複方補充劑顯示降脂效果,但同樣是複方,無法分離納豆的獨立作用
  • 2017年觀察性研究4: 顯示納豆攝取與心血管死亡率降低相關,但這是觀察性研究,存在大量混雜因素(日本飲食模式、生活方式等),無法證明因果關係

關鍵問題

  1. 複方混淆: 大多數顯示效果的研究都使用納豆-紅麴複方23,紅麴含有天然他汀類物質(monacolin K),降脂效果主要來自紅麴而非納豆
  2. 機制不明確: 納豆激酶主要是纖溶酶,其降脂機制缺乏充分證據56
  3. 效果微弱: 即使有效,幅度遠不及他汀類藥物

臨床建議

對於高膽固醇患者:

  • 首選治療: 他汀類藥物仍是金標準,有明確的降低心血管事件和死亡率的證據7
  • 納豆的定位:
    • 不應作為主要治療
    • 可作為健康飲食的一部分,但不要期待顯著降脂效果
    • 如果使用納豆補充劑,需注意是否含有紅麴成分(實際降脂成分)

常見陷阱:

  • 誤信天然產品無副作用: 含紅麴的複方製劑實際上含有他汀類似物,可能有相同副作用
  • 延誤正規治療: 依賴納豆而不使用有效藥物,會增加心血管風險
  • 劑量不足: 研究中使用的大豆蛋白劑量(50克/天)遠超日常飲食攝取

實際應用:

如果患者堅持使用天然產品:

  1. 先確保已接受他汀類藥物評估
  2. 如不耐受他汀,考慮其他證實有效的藥物(依折麥布、PCSK9抑制劑)
  3. 納豆可作為輔助,但需定期監測血脂,確保達標
  4. 注意產品成分,含紅麴的複方需當作藥物對待

美國心臟協會的明確立場1111是:大豆製品(包括納豆)對降低膽固醇的效果微乎其微,不應取代證實有效的藥物治療。

References

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