澱粉可以幫助燃燒脂肪? - 健身
By Ida
at 2015-02-10T12:48
at 2015-02-10T12:48
Table of Contents
版主講的並沒錯,但這是建構在只有某餐沒吃足夠澱粉的情況下。
以長期每天攝取50克碳水以下並非是如此。
血糖下降,升糖素會分泌,身體開始刺激肝臟進行葡萄糖新生,並刺激脂肪beta-oxidation。
當大量草醯乙酸被拿去做葡萄糖新生原料,就無足夠量去參與脂肪beta-oxidation產生物乙醯輔酶A接下來的代謝,以致乙醯輔酶A堆積。
大量乙醯輔酶A雖有抑制脂肪氧化效果,但是當乙醯輔酶A生成酮體時,此抑制效果就被移除。
而且葡萄糖新生是耗能,而非產生能量,所以身體能量赤字更大。
此時乙醯輔酶A生成酮體的需求反而上升。
此時在不攝取碳水下、肝臟不斷進行葡萄糖新生以供應「紅血球」、「視網膜」、「大腦」所需的葡萄糖。而身體其他部位的能量改以酮體供應。
只要不重新攝取大量碳水這樣的循環模式就會成爲常態,這時身體就會完全改以「脂肪酸-酮體」當主要能量,全天燃燒脂肪。
※ 引述《h2243398 (H大)》之銘言:
: 版上似乎有些版友對於澱粉的攝取還有一些疑惑
: 就和大家分享到底澱粉(碳水化合物)對於脂肪代謝扮演怎樣的角色
: ==========================================================
: 正常脂肪要代謝是透過beta-oxidation產生acetyl-CoA後再進入TCA cycle
: 經電子傳遞鍊後得到ATP
: 以16C的palmitate(棕梠酸)為例
: 在正常有碳水化合物的前提下 棕梠酸代謝成acetyl-CoA後再進入TCA cycle
: 總共可獲得106ATP
: 但是在缺乏碳水化合物的情況下
: TCA cycle的中間產物不足 (主要是缺乏oxaloacetate)
: 因此只能將多餘的acetyl-CoA合成ketobody
: 得到的能量只有脂肪氧化時的26ATP
: 所以對身體來說是很不經濟的
: 除非必要是不會輕易走KETOGENESIS
: 身體會想辦法補足TCA CYCLE的中間產物
: 轉而從胺基酸分解來補充
: 如aspartate轉胺為oxaloacetate, glutamate轉胺為alpha-ketoglutarate
: 因此脂肪分解效率相對於充足碳水化合物時來的差
: 所以才說碳水化合物有幫助脂肪燃燒的作用
: 因為碳水化合物提供充沛的TCA中間代謝物維持順暢的能量產生
: 而身體傾向走ketogenesis主要有兩點
: 1.細胞內有大量acetyl-CoA
: 2.TCA cycle的中間代謝物缺乏
: 通常在中長期飢餓的時候才會發生
: 大量的acetyl-CoA會產生負回饋抑制beta-oxidation
: 一邊形成酮體消耗過多acetyl-CoA
: 一邊想辦法生合成TCA cycle的中間代謝物
: 有了中間代謝物立刻走向TCA cycle
: 慢慢消耗acetyl-CoA直到正常比例
: 若繼續缺乏TCA cycle中間代謝物 則上述步驟再重複一次
: 結論:
: 若不攝取充足的碳水化合物
: 不但可能分解肌肉為了要產生TCA cycle的中間代謝物
: 甚至還抑制會脂肪代謝
: 以上有錯或是有專有名詞不懂的歡迎提出指教
: 參考書目:Lehninger- principles of biochemistry 5th
--
以長期每天攝取50克碳水以下並非是如此。
血糖下降,升糖素會分泌,身體開始刺激肝臟進行葡萄糖新生,並刺激脂肪beta-oxidation。
當大量草醯乙酸被拿去做葡萄糖新生原料,就無足夠量去參與脂肪beta-oxidation產生物乙醯輔酶A接下來的代謝,以致乙醯輔酶A堆積。
大量乙醯輔酶A雖有抑制脂肪氧化效果,但是當乙醯輔酶A生成酮體時,此抑制效果就被移除。
而且葡萄糖新生是耗能,而非產生能量,所以身體能量赤字更大。
此時乙醯輔酶A生成酮體的需求反而上升。
此時在不攝取碳水下、肝臟不斷進行葡萄糖新生以供應「紅血球」、「視網膜」、「大腦」所需的葡萄糖。而身體其他部位的能量改以酮體供應。
只要不重新攝取大量碳水這樣的循環模式就會成爲常態,這時身體就會完全改以「脂肪酸-酮體」當主要能量,全天燃燒脂肪。
※ 引述《h2243398 (H大)》之銘言:
: 版上似乎有些版友對於澱粉的攝取還有一些疑惑
: 就和大家分享到底澱粉(碳水化合物)對於脂肪代謝扮演怎樣的角色
: ==========================================================
: 正常脂肪要代謝是透過beta-oxidation產生acetyl-CoA後再進入TCA cycle
: 經電子傳遞鍊後得到ATP
: 以16C的palmitate(棕梠酸)為例
: 在正常有碳水化合物的前提下 棕梠酸代謝成acetyl-CoA後再進入TCA cycle
: 總共可獲得106ATP
: 但是在缺乏碳水化合物的情況下
: TCA cycle的中間產物不足 (主要是缺乏oxaloacetate)
: 因此只能將多餘的acetyl-CoA合成ketobody
: 得到的能量只有脂肪氧化時的26ATP
: 所以對身體來說是很不經濟的
: 除非必要是不會輕易走KETOGENESIS
: 身體會想辦法補足TCA CYCLE的中間產物
: 轉而從胺基酸分解來補充
: 如aspartate轉胺為oxaloacetate, glutamate轉胺為alpha-ketoglutarate
: 因此脂肪分解效率相對於充足碳水化合物時來的差
: 所以才說碳水化合物有幫助脂肪燃燒的作用
: 因為碳水化合物提供充沛的TCA中間代謝物維持順暢的能量產生
: 而身體傾向走ketogenesis主要有兩點
: 1.細胞內有大量acetyl-CoA
: 2.TCA cycle的中間代謝物缺乏
: 通常在中長期飢餓的時候才會發生
: 大量的acetyl-CoA會產生負回饋抑制beta-oxidation
: 一邊形成酮體消耗過多acetyl-CoA
: 一邊想辦法生合成TCA cycle的中間代謝物
: 有了中間代謝物立刻走向TCA cycle
: 慢慢消耗acetyl-CoA直到正常比例
: 若繼續缺乏TCA cycle中間代謝物 則上述步驟再重複一次
: 結論:
: 若不攝取充足的碳水化合物
: 不但可能分解肌肉為了要產生TCA cycle的中間代謝物
: 甚至還抑制會脂肪代謝
: 以上有錯或是有專有名詞不懂的歡迎提出指教
: 參考書目:Lehninger- principles of biochemistry 5th
--
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