A non-random study looking at the effects of a six week mindfulness-based stress reduction (MBSR) program on immunity, the endocrine system, stress, mood, and functional health of individuals with HIV. Natural killer cell activity increased significantly in the MBSR group, while there was no such gain in a comparison group. No significant effects on endocrine, psychological, or health function variables in the MBSR group. The results indicate that MBSR may strengthen the immune system of individuals with HIV, though the authors note that this is a non-randomized study with a small number of participants. (Zach Rowinski 2005-03-03)