
營養師曾建銘指出,體重計僅顯示重量變化,無法區分脂肪、水分或肌肉流失,警告減重過快、熱量攝取過低或缺乏蛋白質與阻力訓練,可能導致肌肉一起流失,強調應觀察體重趨勢、腰圍、肌力與營養狀況,才能達成『減掉該減的,留下該留的』健康減重目標。
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減重過程中,許多人僅依賴體重數值判斷成效,但體重計無法區分脂肪、水分與肌肉的變化,可能導致誤判減重品質。
2026/10/03 08:21
營養師曾建銘表示,體重計只能呈現體重輕重,無法分辨減掉的是脂肪或水分等,提醒減重若忽略熱量攝取過低等關鍵,恐讓肌肉也流失;情境照。(圖取自freepik)
〔健康頻道/綜合報導〕減重時看到體重下降,很多人通常覺得開心。不過,營養師曾建銘表示,體重計只能告訴你「今天比較輕」,卻無法分辨減掉的是脂肪、水分,還是重要的肌肉。因此,體重偏高不代表肌肉多;體重下降,也不代表減掉的全是脂肪,必須了解「瘦多少」和「瘦得好不好」,其實是兩件事。他提醒,減重若熱量攝取過低、蛋白質吃不夠、沒搭配阻力運動,當心肌肉一起跟著掉。
減重過快當心不只脂肪掉
曾建銘於臉書粉專發文指出,肥胖並不代表肌肉一定足夠,肥胖與肌少症甚至可以同時存在,稱為「肌少型肥胖」。若減重時熱量砍得太兇吃太少,加上蛋白質不足、沒有做阻力訓練、活動量下降,身體除了得動用脂肪,肌肉也可能一起流失。提醒極低熱量飲食僅適合特定情況短期使用,不建議自行長期執行。
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蛋白質不是健身族才需要
此外,蛋白質不只是健身的人需要,在適當熱量限制下,攝取足夠的蛋白質,也有助於維持肌肉量。不過,曾建銘提醒,有慢性腎臟病或需要限制蛋白質的人,不能自己套公式,必須依據腎功能與病況個別調整。
阻力訓練維持肌肉、體能
除了吃足蛋白質,曾建銘指出,肌肉也需要刺激,才有「留下來的理由」。曾建銘表示,指引建議成人每週至少進行2天阻力訓練,減重期間對於維持肌肉與身體功能尤其重要。因此,較理想的減脂組合是:適當熱量赤字+攝取足夠且個別化的蛋白質+阻力訓練」,而不是只靠少吃、跑步和每天量體重。
曾建銘並說明,體重掉得少,不一定是失敗,舉例來說,A減5公斤,力量下降、肌肉變少;B減3公斤,腰圍縮小、力量維持,不能只靠體重計判斷誰減得比較好。尤其快速減重、食慾變差或體重掉太快時,更要留意蛋白質、蔬菜與纖維有沒有攝取足夠、是否越來越沒力,以及有沒有進行阻力訓練。
曾建銘總結叮嚀,減重諮詢時常觀察4件事:體重趨勢、腰圍與脂肪、肌肉與力量是否守住、營養是否足夠,因為真正優質的減重不只是體重變輕,而是「減掉該減的,留下該留的」。

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