Hello, Interesting article however the copyright on it is 2003 so it is 5 years old already and like els, I have never seen this as criteria for dx depression.
My reference of 2008 indicates studies have shown the severe zinc deficiency significantly depress immune function because zinc is needed for both the development and the activation of a very important class of white blood cells (lymphocytes) called T-cells. When people with low zinc are given zinc supplements, their T-cell count goes up and they're better able to fight off disease.
The symptoms of decreased B6 are many so please do see your physician before you start buying a lot of supplements as natural cures may interact with your regular medications.
Thank you for sharing this article.