Chocolate and depression linked, but how?

This afternoon, with the publication of this study, we know more about the relationship between chocolate and mood.

But not much more.

Researchers at the University of California analyzed just over 900 men and women's self-reported chocolate consumption and assessed those people's symptoms of depression (if any) using a standard screening survey. They found that those who ate the most chocolate were also those with the most symptoms of depression. The more chocolate eaten, the worse the depression. That held true for men and women alike.