The Mind is Neural Chemical
When I was nineteen, a nurse came into work to give flu shots. She administered these while telling everyone about stress and its effects on the body. If there was a proselytizer for the stress effect, it was her, and it was well before Dr. Oz and others started talking about it.
At the time I thought she was crazy. She was describing an emotion, and while I knew it had a chemical basis, that didn’t seem to be enough to account for everything she was claiming, such as stress’s effects on the risk of cancer, Alzheimer's and addiction.