Mind-body interventions such as meditation, yoga*, and tai chi can reverse the molecular reactions in our DNA that cause ill-health and depression, according to a study by scientists at the universities of Coventry and Radboud. When a person is exposed to a stressful event, their sympathetic nervous system (responsible for the “fight-or-flight” response) is triggered, which increases production of a molecule called nuclear factor kappa B (NF-kB). That molecule then activates genes to produce proteins