“I think, therefore I am” is perhaps the most familiar one-liner in western philosophy. Even if the stoners, philosophers and quantum mechanically-inclined skeptics who believe we’re living an illusion are right, few existential quips hit with such profound, approachable simplicity. The only catch is that in Descartes’ opinion, “we” – our thoughts, our personalities, our “minds” – are mostly divorced from our bodies. The polymathic Frenchman and other dualist philosophers proposed that while the mind exerts control over our physical interaction with the world, there is a clear delineation between body and mind; that our material forms are simply temporary housing for our immaterial souls. But centuries of science argue against a corporeal crash pad. The body and mind appear inextricably linked. And findings from a new study published in Cancer by a Canadian group suggest that our mental state has measurable physical influence on us – more specifically on our DNA. Lead investigator Dr. Linda E. Carlson and her colleagues found that in breast cancer patients, support group involvement and mindfulness meditation – an adapted form of Buddhist meditation in which practitioners focus on present thoughts and actions in a non-judgmental way, ignoring past grudges and future concerns -- are associated with preserved telomere length. Telomeres are stretches of DNA that cap our chromosomes and help prevent chromosomal deterioration -- biology professors often liken them to the plastic tips on shoelaces. Shortened telomeres aren't known to cause a specific disease per se, but they do whither with age and are shorter in people with cancer, diabetes, heart disease and high stress levels. We want our telomeres intact. In Carlson’s study distressed breast cancer survivors were divided into three groups. The first group was randomly assigned to an 8-week cancer recovery program consisting of mindfulness meditation and yoga; the second to 12-weeks of group therapy in which they shared difficult emotions and fostered social support; and the third was a control group, receiving just a 6-hour stress management course. A total of 88 women completed the study and had their blood analyzed for telomere length before and after the interventions. Telomeres were maintained in both treatment groups but shortened in controls. Previous work hinted at this association. A study led by diet and lifestyle guru Dr. Dean Ornish from 2008 reported that the combination of a vegan diet, stress management, aerobic exercise and participation in a support group for 3 months resulted in increased telomerase activity in men with prostate cancer, telomerase being the enzyme that maintains telomeres by adding DNA to the ends of our chromosomes. More recent work looking at meditation reported similar findings. And though small and un-randomized, a 2013 follow up study by Ornish, again looking at prostate cancer patients, found that lifestyle interventions are associated with longer telomeres. The biologic benefits of meditation in particular extend well beyond telomere preservation. Earlier work by Carlson found that in cancer patients, mindfulness is associated with healthier levels of the stress hormone cortisol and a decrease in compounds that promote inflammation. Moreover, as she points out, “generally healthy people in a work-based mindfulness stress reduction program have been shown to produce higher antibody titers to the flu vaccine than controls, and there has been promising work looking at the effects of mindfulness in HIV and diabetes.” Past findings also show that high stress increases the risk of viral infections – including the common cold – as well as depression and cardiovascular disease. More via Scientific American.