維生素C的禁忌與保存在飲食方面,維生素C應避免與大量海鮮同食。原因很簡單,因為蝦蟹類的軟殼海洋生物體內有大量的五價砷離子。五價砷離子本身沒有毒性,但遇到維生素C就會還原成有毒的三價砷離子,即三氧化二砷(俗稱砒霜),導致不同程度的中毒。
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