This enzyme is important because it helps break down the amino acid leucine.

这种酶十重要，因为它能氨基酸白氨酸。

One last factor in Ketosis preserving muscle is leucine.

酮症最后一个储存能量的要素是亮氨酸。

Without this enzyme, leucine can only be broken down part-way.

没有这种酶，亮氨酸只能被部。

When you're in ketosis, you have a higher fasting blood leucine level.

当你处于酮症状态时，空腹的血液中亮氨酸水平会更高。

Glycine, alanine, valine, leucine are all nonpolar assets and this is how you drop them in an exam.

甘氨酸，丙氨酸，缬氨酸，亮氨酸全都是非极性的，这就是你如何征考试的秘诀啦！

The bacteria hiding out between your toes produce this acid when they're chomping away on leucine.

当隐藏在脚趾的细菌产生亮氨酸时，就会产生这种酸。

Corn is actually very high in leucine.

玉米中亮氨酸含量实际上非常高。

Well, it'll probably track with plasma leucine.

嗯，它可能会追踪血浆亮氨酸。

And a quality whey protein would be the highest leucine available?

优质白的亮氨酸含量最高吗？

So we looked at intracellular leucine.

因此我们研究了细胞内的亮氨酸。

And then I said, OK, well, maybe leucine isn't getting into the cell.

然后我说，好吧，也许亮氨酸没有进入细胞。

Eggs, whey protein, eggs are going to be around nine percent leucine, you know, beef, chicken.

鸡、白，鸡中大约含有 9% 的亮氨酸，你知道，牛肉、鸡肉也是如此。

Measurements like fractional synthetic rate within 0 to 5 hours post-exercise were reduced by as much as 20 percent through leucine tracer observations.

通过亮氨酸示踪观察，诸如运动后0到5小时内的数合成率等测量值降低了20%。

And leucine is a key branch chain amino acid that has an anabolic effect on the body so it preserves lean body mass.

而亮氨酸是一种在体内起合成代谢作用的，关键性支链氨基酸，所以它能保护体内脂肪较少的肌肉块。

So like the worst sources of protein in the diet are still like three times more leucine than you get in collagen protein.

因此，就像饮食中最糟糕的白质来源一样，亮氨酸仍然比胶原白多三倍。

And my hypothesis was, well, however long leucine is elevated in the blood is going to be how long protein synthesis stays up.

我的假设是，血液中亮氨酸升高的时间长短决定了白质合成维持的时间长短。

Plant sources of protein tend to be lower in branched-chain amino acids, they tend to be lower in essential amino acids, and tend to be lower in leucine.

植物来源的白质往往支链氨基酸含量较低，必需氨基酸含量较低，亮氨酸含量较低。

Collagen protein is going to be least ideal for post-workout protein because of the fact that it's, you know, it lacks significant amounts of leucine, et cetera.

胶原白是最不理想的运动后白质，因为它缺乏大量的亮氨酸等。

In specific, Dr. Layne Norton explains that you need to go to greater lengths to get enough of that key muscle protein synthesis stimulating amino acid leucine if you are relying on plant sources of protein.

具体来说，莱恩·诺顿博士释说，如果你依赖植物来源的白质，你需要吃得更多，以获得足够的关键肌肉白质合成刺激氨基酸亮氨酸。

There is, so far, no cure for isovaleric acidemia, but some treatments — like avoiding foods rich in leucine, and taking supplements of other, non-threatening amino acids — can help keep patients safe.

目前没有治疗异戊酸血症的方法，但是一些疗法——比如避免进食白氨酸过多的食物，从其他物质中，比如没有威胁的氨基酸，能够保证患者安全。