I have enormous help with depression by avoiding all animal protein and limiting plant protein. (Plant protein is nuts, beans, and seeds.). Also avoid GMO foods because the high pesticides on them contributes to depression. Also avoid wheat, oats, and barely unless they are organic, because in a process called "desiccation, " they are sprayed with pesticides a few days before harvest. Also experiment with avoiding nightshade foods. Supplements that help are zembrin, inositol, and P5P ( active vitamin B6). But most crucial for overcoming depression is to minimize eating protein. It would be too lengthy here to explain how this strategy increases serotonin. Especially avoid animal protein. (don't eat anything with a face and avoid eggs and all dairy). You already know to choose whole grains over refined grains, and avoid sugar. (Most sugar is GMO beets, anyway.)
Please comment on whether this helps you. It is saving me from unbearable misery. I did a great deal of research on this.