原文视听

That's roughly the equivalent of having a 20-watt light bulb
这就相当于有一盏20瓦的灯泡
on inside your head, all the time.
装在你身体里 还一直点亮着
Most other primates use
多数其他灵长类生物
only 10% of their energy to fuel their brain.
脑部只消耗10%的能量
Our huge, hungry brains make us the exception.
我们更大 更耗能的脑袋使我们有别于它们
Our best guess is that, in humans,
最合理的猜测是
once cooking enabled the gut to become smaller,
烹饪使人类的肠胃变小
then the energy spared from looking after the gut
多余的能量就不用供给胃部
was made available to the brain...
直接供给脑部了...
a very expensive organ that
这么耗能的器官
certainly needs to be fuelled from somewhere.
当然需要能源补给了
So it seems likely that what cooking did was make those big brains possible.
很可能正是烹饪 让人类大脑得以进化
But the big brain which has served us so well...
但是我们一向表现良好的大脑...
is now causing us great problems in the 21st century.
却为21世纪的我们带来了大麻烦

重点解释

then the energy spared from looking after the gut was made available to the brain...多余的能量就不用供给胃部直接供给脑部了...

spare ... from使某人免受(不愿意之事)

I'll spare you from having to apologize formally.

我将省去你的正式道歉。

The doctor tried to spare him from pain.

大夫设法使他免受疼痛。

available to可以用来(可能得到的；现有的)

Our aim is to make books available to all.

我们的目的是使大家都能看得到书。

My mom is available to baby-sit this weekend.

我妈妈在这个周末可以照顾小宝宝。