Mental health food refers to food that does not benefit your physical health, but sure makes you feel awesome while you're eating it.

“心灵健康食品”指的是对你的身体健康没有好处，但吃起来却能让你感觉很棒的食物。

来看下例子：

My vegan hippie family have been feeding me salad all week. I just wanna watch Gilmore Girls and eat mental health food.

我的素食主义家人整整一周都给我吃蔬菜沙拉。我只想一边看《吉尔莫女孩》一边吃心灵健康食品。