There has been some research in this area. This paper http://www.innerfire.nl/files/concentration-pickkers.pdf http://www.innerfire.nl/files/concentration-pickk

There has been some research in this area. This paper http://www.innerfire.nl/files/concentration-pickkers.pdf http://www.innerfire.nl/files/concentration-pickkers.pdf has one of my favorite opening sentences ever: Objective: To investigate whether a special concentration/meditation technique employed by a Dutch individual known as ‘the iceman’ can influence anatomic nervous system activity and the innate immune response. Looking more broadly in the literature, you can find many "biofeedback" studies related to inflammation and the immune system. For instance http://link.springer.com/article/10.1007/s10484-010-9139-5 http://link.springer.com/article/10.1007/s10484-010-9139-5 shows some interesting results in normal people (not just "the iceman"), but unfortunately, followup studies by that group were impeded by the untimely death of the last author :(