Hollywood star Julia Roberts has emerged from a "pop culture fest" sickened by what Americans read and watch on TV.The actress spent the summer reading gossip magazines and watching trash culture TV shows in an effort to understand why Americans are so obsessed with celebrities - and it gave her a headache and left her exhausted.She says, "I’ve actually gone on a pop culture fest. The TV shows and gossip magazines - it seems so polluting and toxic now. It’s exhausting just looking at a newsstand these days. Your eyes cross. You can’t even focus."People aren’t as interested in making a cool movie or constructing interesting characters. Now it’s just about being big and shiny and fabulous."