Will giving up junk food help me loose weight and what is considered as junk food?

I've checked out every diet known to man but nothing worked as good as acai berry. I realize they say that pills won't work, but they sure worked for me, and they've been shown on CBS News too. There is a free trial on right now at http://bisils.dietinstitute.info , try it out, what is the worst that could happen?