Few would disagree that the foods they eat affect how they feel. I feel much better eating vegetables and rice for dinner than I do a cheese pizza.
I take this analogy one step further by being selective about the information I expose myself to.
Media geared for average consumption : food geared for average assumption.
Consuming popular television, movies, magazines is akin to consuming McDonalds, potato chips, and deep-fried Twinkies.
Delicious in the short run (reading about gossip and exploits, even love songs on the radio are scary) — deadly in the long run (how do they impact your values and what you think about?).
Think of it as a mental paleo diet. Tasty.