Fermented foods are teeming with helpful probiotic bacteria, like lactobacillus and bifidobacteria.

发酵食品中充满了有益的益生菌，如乳酸菌和双歧杆菌。

Tryptophan in our diet is broken down – by a group of gut microbes called bifidobacteria – into smaller metabolites that can cross the blood-brain barrier.

我们饮食中的色氨酸被一组称为双歧杆菌的肠道微生物分解成更小的代谢物， 可以穿过血脑屏障。

It appears that if we don't have a sufficient abundance of bifidobacteria in our gut, due to eating a poor diet, this process will be inhibited, with consequences for our mental health.

看来，如果我们的肠道中没有足够丰富的双歧杆菌，由于饮食不当， 这个过程就会受到抑制， 从而对我们的心理健康产生影响。