
風濕免疫科醫師沈明忠指出,高蛋白飲食重點在於吃夠、吃對、來源多樣化,而非盲目攝取過量;中高齡族群每日蛋白質攝取建議為1.2-1.6g/kg,每餐一份手掌大小的蛋白質來源約可提供20-30g,腎功能異常者應依個別狀況調整,不可套用一般健身建議。
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高蛋白食品在市場上普及,許多民眾誤解蛋白質攝取量越多越好,甚至懷疑過量攝取會傷腎,風濕免疫科醫師沈明忠針對此進行解說。
2026/10/06 06:24
中高齡族群不妨每餐安排1份明確的蛋白質來源,例如魚、蛋、雞肉等,1個手掌大小的魚、肉或豆腐,大約可提供20–30g蛋白質,作為日常估算;圖為情境照。(圖取自freepik)
〔健康頻道/綜合報導〕高蛋白食品當道,很多人以為蛋白質吃越多越能長肌肉。風濕免疫科醫師沈明忠指出,蛋白質重點不是「拚命吃」,而是吃夠、吃對、來源多樣化;魚、肉類、大豆製品都可提供蛋白。中高齡族群想維持肌肉量,每日約1.2-1.6g/kg可作實用參考,每餐1個手掌大小的肉或豆腐可提供20–30g蛋白質。他提醒,腎功能異常者不能自行套用一般健身族群的建議,應依腎功能情況調整。
沈明忠在臉書發文分享,這幾年「高蛋白」幾乎成了健康飲食的關鍵字。高蛋白牛奶、高蛋白咖啡、高蛋白餅乾,甚至連洋芋片都可以加蛋白質。因此讓民眾不免有「蛋白質是不是吃越多越好」、「吃太多會不會傷腎」等疑問。
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沈明忠表示,一項研究顯示,當每日蛋白質攝取大約來到1.5-1.6 g/kg左右後,對多數人而言,再繼續增加,肌肉與力量增加的額外效益就逐漸有限。所以重點不是追求「一天吃到最高多少」,而是先確定自己有沒有吃夠。要注意的是,對正在進行阻力訓練的人來說,增加蛋白質確實有助於肌肉合成與恢復,但絕非無限增加。
蛋白質的品質和總量一樣重要
沈明忠提到,蛋白質來源同樣重要。魚、蛋、乳製品、肉類、大豆製品,都可以提供蛋白質;植物性蛋白也能提供完整營養,但不同植物的胺基酸組成與消化利用率有所差異,因此建議讓蛋白質來源多樣化。
他還直言,也不要只看食品包裝上的「蛋白質幾克」。1杯無糖優格、1顆蛋、1份魚,和一包添加蛋白粉的餅乾,即使蛋白質含量相同,整體營養價值仍可能不同,「高蛋白」3個字不會自動把超加工食品變成健康食品。
慢性腎臟病留意蛋白質攝取量
沈明忠表示,蛋白質攝取增加後,腎臟過濾負荷確實會增加,但目前研究並不支持健康成人吃較高蛋白飲食就一定造成腎臟損傷。不過,已有慢性腎臟病、蛋白尿或腎功能異常者,就不能自行套用一般健身或減重族群的建議,應依腎功能、疾病階段及是否接受透析等情況調整。
中高齡更要顧肌肉
沈明忠提醒,隨著年齡增加,肌肉對蛋白質刺激的反應會下降,也就是所謂的「合成阻抗」(anabolic resistance)。因此,中高齡族群如果又吃得少、活動量不足、生病或長期臥床,肌肉流失速度可能更快。如果目標是維持肌肉、健康老化、減脂或有規律運動,可將每日約1.2–1.6 g/kg當成實用的參考範圍,再依年齡、活動量、總熱量與健康狀況調整。
不想每天拿計算機算蛋白質,沈明忠建議,不妨每餐安排一份明確的蛋白質來源,例如魚、蛋、雞肉、豆腐、豆類或乳製品;1個手掌大小的魚、肉或豆腐,大約可以提供20–30 g蛋白質,作為日常估算即可。

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