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#菸害
每日健康
備孕戒煙是基本功!醫揭「1營養素」缺乏恐影響胎兒基因表現 這類人更要注意
 隨著遺傳醫學的進展,除了基因突變之外,「DNA甲基化」的異常也被證實對胎兒發育有關鍵影響。特別是在備孕與孕期階段,若夫妻接觸煙害或飲食失衡,可能誘發DNA甲基化重編機制異常,進而導致胎兒發育缺陷。茂盛醫院遺傳基因實驗室主任李月君指出,DNA甲基化是一種不改變DNA序列、卻能影響基因表現的重要修飾機制。她說明:「在精子與卵子形成時會進行第一次甲基化重編,胚胎發育過程中再進行第二次。如果這兩次出現異常,即使基因本身正常,胎兒仍可能發育異常,甚至罹患疾病。」 備孕與孕期避免煙害,是守護胎兒健康的第一步茂盛醫院生殖醫學科羅偉哲醫師強調:「備孕夫婦雙方都應戒煙,並遠離毒物環境,否則將干擾DNA甲基化作用。」特別是二手煙與三手煙,更可能在胎兒發育過程中造成基因表現異常,不僅影響出生健康,甚至可能影響未來生殖功能。此外,若在備孕期間未成功戒煙,男性精子與女性卵子的DNA甲基化也可能產生缺陷,結合後的胚胎將有更高風險出現發育異常。 葉酸攝取不足影響廣泛,建議補充「活性葉酸」根據國民健康署108年至112年的「國民營養健康調查」結果顯示,台灣有10.29%的育齡婦女葉酸攝取不足。葉酸是DNA甲基化反應中的重要甲基供應來源,缺乏可能導致胎兒神經管缺陷、母體貧血,甚至降低懷孕成功率。羅醫師指出,女性可從深綠色蔬菜(如菠菜、空心菜、紅莧菜)、全穀雜糧(如鷹嘴豆、燕麥、紅藜)、堅果、海鮮(如鯖魚、牡蠣)及肝臟類中攝取天然葉酸。同時提醒,應避免攝取醃漬、加工、高熱量及含亞硝酸鹽等食物,以免增加甲基化異常風險。 葉酸代謝功能異常者,建議服用「活性葉酸」由於部分民眾體內的MTHFR酶活性較低,無法順利將一般葉酸轉化為身體可利用的「活性葉酸」(5-MTHF)。李月君主任提醒:「葉酸未被有效轉化會累積於體內,對孕婦可能造成流產、胎兒神經缺陷、免疫異常,對新生兒則可能提高過敏、氣喘與自閉症風險。」因此,對於有葉酸代謝障礙風險者,建議在醫師評估下選擇補充活性葉酸營養品,以保障母胎雙方健康。 提醒:備孕與孕期是胚胎健康發展的關鍵時期,建議夫妻共同戒煙、遠離污染環境,並留意葉酸攝取狀況。透過積極維護DNA甲基化正常進行,可大幅降低胎兒發育異常風險。【資料來源:台中茂盛醫院遺傳基因實驗室李月君主任、生殖醫學科羅偉哲醫師;國健署國民營養健康調查】  42歲無病史卻罹患乳癌三期,醫生竟神回:妳得癌症就是因為「不生小孩」!真相讓她一秒崩潰!
2025/07/17
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