According to the Washington Post, "About 23 percent of those who drank one or no cans of soda a week carried a gun or knife, and 15 percent had perpetrated violence toward a partner. In comparison, among those who consumed 14 or more cans a week, 43 percent carried a gun or knife and 27 percent had been violent toward a partner, the researchers found. Similarly, violence towards peers rose from 35 percent to 58 percent while violence towards siblings rose from 25.4 percent to 43 percent."
The study was published online in something called "Injury Prevention". Despite the fact that I've never heard of this "journal", somehow the study got National coverage in the news. To the author's credit, they admitted that the study did not prove causality and there may be other factors that weren't accounted for. The students self reported their soft drink consumption and their "violent" tendencies.
As the mother of a teen, I can tell you that teen boys think they are "badder" than they are and I would guess some of the self-reporting would be questionable. Just sayin'....
This story, with it's sensational headlines, should make us all take pause with the hundreds of pseudo-science reports that come out daily as "breakthroughs" or "news". With 24 hour news shows, the Internet and the need for content that will grab the reader, a big dose of skepticism should be our first thought.