Q. What does the brain have to do with the immune system, and vice versa?
A. The brain and the immune system are closely connected. In fact, the emotional brain layer is believed to control immune system function. This suggests that whatever goes on the brain has the potential for being acted out through the immune system, and whatever is going on in the immune system can impact the brain. In general, what is good for the Immune System is good for the Brain, and vice versa.
You may want to refer to several of the topics under Brain References for additional information.