https://www.truehealthcfm.com/blog/do-calories-matter-on-a-keto-diet

提到了糖异生的额外成本每天4到6百卡路里，而且低碳确实有代谢优势

同样卡路里不同类型的能量，估计转换消耗的损耗比例也有区别


Metabolic Advantage
According to one hypothesis, low-carb diets have a distinct “metabolic advantage” over diets with higher carbohydrate content when the amount of calories consumed are the same.3 This metabolic advantage is essentially an increase in the expenditure of energy (calories) on the low-carb diet. Factors that may account for this higher rate of calorie burning include:

1. Higher energy costs associated with high thermic effect of protein. Greater protein intake on the keto diet is more energetically costly. When carb intake is low, protein is used to make glucose via a process called gluconeogenesis. The energy cost for this is estimated to be ~ 400 to 600 calories/day from a simple diet change.13


2. Increased ability to burn fat. Keto-adaptation more than doubles the rate of fat burning compared to a high-carb diet.14 In addition, lower levels of insulin trigger fat burning, reduce fat storage, and increase lean mass.4,5


Published studies established the metabolic advantage of low-carb diets.4,3,15 A recent pilot study–though flawed and biased against low-carb eating–showed a significant increase in energy expenditure (100-150 calories/day) associated with a ketogenic diet.16 If sustained, this would lead to ~ 10 to 15 pounds of fat lost, or not gained, over a year.
【 在 howmissyou 的大作中提到: 】
: 您的意思，是不是指：假设关闭胰岛素功能，那么热量说就是不正确的？
:     我的感觉啊，热量说可能是正确的。生酮导致了糖异生，根据百度百科，当肝或肾以丙酮酸为原料进行糖异生时，糖异生中的其中七步反应是糖酵解中的逆反应，它们有相同的酶催化。但是糖酵解中有三步反应，是不可逆反应。在糖异生时必须绕过这三步反应，代价是更多的能量消耗。
:     所以我更倾向于理解为：生酮时，热量消耗增加了，所以热量说还是正确的（虽然摄入增加了，但消耗也增加了）。
: ...................
--
FROM 167.220.233.*