"You are what you eat" - it's a common English expression. Basically, it means if you eat fatty foods, you'll be a fatty. Conversely, if you eat muscle-bound foods, guess what? You'll be muscle-bound.
This idea also applies to the media you consume. Don't believe me? Enjoy this 3-minute experiment:
First, watch a little bit of this (maybe a minute):
Note how you feel. Don't try to describe it, just note the feeling.
Now, watch about a minute of this, and do the same:
Most likely, the first one makes you feel lovey-dovey, while the second one makes you feel driven. Now tell me, which one is more useful to you?