不飽和脂肪

不飽和脂肪是指:除了單鍵,還含有至少一個雙鍵的脂肪或脂肪酸鏈。如果只有一個雙鍵,則稱為單元不飽和脂肪;含有多於二個以上的雙鍵則稱為多元不飽和脂肪。當雙鍵形成時,一對氫原子會被消除,因而與碳原子相結合的氫原子未達到最大值,即“不飽和”。在細胞的新陳代謝中,不飽和脂肪所產生的能量相比飽和脂肪較少。脂肪的不飽和程度越高(雙鍵數量越多),其過氧化的可能性越高,從而越容易對人體健康不利。這時需要抗氧化物來防止這一情况的發生。不飽和脂肪酸在高温加熱後具有毒性,常見於烹飪用的植物油。

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