If you surround yourself with Big Macs & french fries most days, you’re going to have problems with your health. If you surround yourself with good books & good people, my bet is you'll have a good life.
Look around. What surrounds you? Who surrounds you? What gets your attention? What activities soak up your free time? Are they growth-oriented? Do they build up your character or wear it down?
Just as "what goes up must come down;" so too, "what goes in must come out."