The key to this phenomenon is a protein called Brain-Derived Neurotrophic Factor, or BDNF for short.

产生这一现象的原因跟一种名叫“脑源性神经营养因子”的蛋白质（简称 BDNF）有关。

So all of those things are important for boosting up your BDNF.

所以所有这些对提高你的 BDNF 都很重要。

One big thing exercise does is it raises your levels of brain derived neurotrophic factor — BDNF.

锻炼的一个很大的作用就是，它能提高你脑源性神经营养因子的水平。

This impressive result had John Ratey nickname BDNF the " Miracle-Gro for the brain."

鉴于这一现象，John Ratey 给 BDNF 起了一个昵称：“大脑的金坷垃”。

BDNF is very important to learning, memory and higher thinking.

脑源性神经营养因子对学习、记忆和高级思维都非常重要。

And BDNF is the secret sauce that makes the whole process possible.

BDNF 就是使整个过程成为可能的秘诀。

And it's unnecessary anyway, because your brain naturally produces more BDNF when you learn new things and when you exercise.

无论如何，这都是不必要的，因为当你学习新事物和锻炼时，你的大脑自然会产生更多的 BDNF。

And this happens through a protein that's produced in the brain called BDNF, brain-derived neurotrophic factor.

这是通过大脑中产生的一种叫做 BDNF 的蛋白质实现的，这是大脑衍生的神经营养因子。

Protect yourself and your brain from stress, you release this protein known as BDNF, brain derived neurotrophic factor.

为了在这种压力下保护你自己及你的大脑, 你会释放出这种被称为BDNF的蛋白质, 大脑衍生出的神经营养因子。

Now, the amount of BDNF produced is actually a function of the volume of physical activity.

BDNF 产生的数量实际上是体力活动量的函数。