Brain candy describes an experience that is enjoyable because it stimulates the mind pleasantly, but doesn't actually make it work, usually in reference to light and fluffy books, movies, TV shows, and other entertainment.

Brain candy（脑轻松）指让大脑轻松愉快的体验。这种体验能够刺激大脑、让其感到愉悦，同时又不会让大脑处于工作状态，多指轻松简单的书籍、电影、电视节目以及其他的娱乐形式。

For example:

No one ever called Star Trek great drama, but it makes pretty good brain candy.

从来没有人说过《星际迷航》是一部伟大的作品，但它作为一部轻松娱乐的片子还是很好的。