斷食和瘦體重 - 健身
By Cara
at 2018-07-19T05:16
at 2018-07-19T05:16
Table of Contents
ref
① Contributions of gluconeogenesis to glucose production in the fasted state.
https://www.jci.org/articles/view/118803/pdf
②Fuel Metabolism in Starvation
https://www.annualreviews.org/doi/abs/10.1146/annurev.nutr.26.061505.111258
http://i.imgur.com/GHcncTS.jpg
http://i.imgur.com/pp6udCn.jpg
人類的腦袋可以由葡萄糖或者酮體供能。
在斷食(饑餓)初期,會先依賴肝醣,然後靠糖質新生去產生葡萄糖,一直到一星期之後,血酮讀數足夠足才會減少對葡萄糖的需要 (ref 2)
http://i.imgur.com/kOZsGTS.jpg
血醣濃度在斷食 14 小時為 5.2 左右, 42小時即近兩天是 4.3 ,取均值 4.75 ,一天的量是 114g 葡萄糖。
斷食 22小時,葡萄糖有 69% 由糖質新生產生。到 42 小時提昇到 94% (ref 1)
糖質新生的葡萄糖產生,有 10% 左右是由脂肪酸提供材料,其餘 90% 由蛋白質。
這和低碳水不一樣的是,因為沒有食用蛋白質作材料,靠的是自體蛋白質,即瘦體重。
我對無意義的斷食,尤其是超出 24 小時的,絕無好感,這是和身體建構的材料去開玩笑。
會認為斷食不掉瘦體重,葡萄糖是光合作用生成的嗎?
又,運動或者訓練,只要有消耗到肝糖,就會加速這流失的速度。隨便扯一個例,如果是運動4小時每小時耗能 600 大卡,這 2400 大卡就是普通人一天的消耗,換個方式思考是斷食了 24 小時的程度。
故事完。
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