Nearly all my negative tweets trace back to reading Hacker News. I need to improve my information diet, and many other people do too.
Feature film producer, screenwriter, and actor Tom Malloy put out a series of CDs on raising funds for feature films, and in them includes a wonderful information diet hack. When raising money for a film, he sets up three "appointments" per day. The appointments are actually just statements along the lines of "you are going to raise $5,238,005 for your film" (or whatever amount his budget requires). Then he sets his phone to give him alerts for each of these "appointments," and the same device which distracts so many others from their goals keeps him on track to achieve his.
You can repurpose this technique for any type of goal, obviously.