Seems like a pretty worthless study that indicates almost nothing. Lazy journalists, who are honestly worse than worthless, pick these lame correlation studies up and propegate weird misconceptions about increasing "risk factors". It's intellectually dishonest to even call the correlation increased "risk" when the cause of the link cannot be feasibly confirmed.

The sane assumption from this study is that depression or addiction prone people are more likely to look for satisfaction in glutany. Unfortunately that doesn't generate as much fear/ad rev.