When does it become too much information?

We live in a world now where the information comes to us just as easily as going out and finding the information. In fact, it is easier now to get it to come to us than it is to go out and get it, IMHO. A bit like home-delivered fast food. Is it getting fattening? When do you know it is getting to be too much information? What do you use as your meter to tell you enough is enough? How do you know when it is interfering? How carefully do you analyse the information before you use it / retweet it / forward it / quote it?