I have read The Mood Cure and The Diet Cure, but I have not read Depression-Free Naturally. I've been getting great results just from Nature's Way brand 5-HTP plus a general amino acid complex (sort of like a multivitamin) that has all the aminos except for L-tryptophan, which I get from Whole Foods. (I've looked online for something more economical than Whole Paycheck, but have not been able to find anything that's equivalent.) I don't use all the separate bottles/doses of this and that that Ross recommends.
"Let food be thy medicine and medicine be thy food." -- Hippocrates