Yes, body chemistry can affect everything. As a high copper person, I know that. Mood, energy, life outlook, the works. Glad you mentioned hair testing, Joe. I am sold on it. It's not only revealed my high copper but low phosphorus (poor digestion) but calcium shell, etc. The great news is that everything can be corrected in time with the right supplements, diet, adequate rest, and detox protocols. BTW, I don't claim to be an expert, but I would only do hair testing at labs that don't wash the hair prior to the test. As far as I know, TEI and ARL are the only ones. (Correct me if I'm wrong.)
I use ARL, http://www.arltma.com, and trust their results. I used to consult with one of the owners there (his dad founded ARL), and he knew a lot. He himself had been high copper. Now I work with a practitioner who has been very well-trained in all aspects of hair analysis...he's helped me tremendously.