I struggle with this too. Books and newspapers are a good resource of course. It's also quite good to read some academic humanities and social science writing. HN and other fora make a big point of free speech, open minded discussion, but I find that there aren't always articles from intellectuals in the academic sphere on HN. Of course these sources have biases of their own, but isn't the point of open minded free speech to read those with whom you disagree?
I don't think my info diet is very balanced. I'd love to be introduced to other places where people talk about different things