For a number of years, meditation, MBSR  and mindfulness in general have been the subject of controlled clinical research.  Some studies have suggested that therapy incorporating mindfulness might help people with anxiety, depression and stress. There are many other studies about the benefits of mindfulness.   Please refer to the following links to learn more about the subject:

UMass Medical School, Center for Mindfulness

UCLA Mindful Awareness

NYU – STEINHARD Department of Applied Psychology

American Psychological Society

Washington Post: Harvard Neuroscientist – Meditation not only reduces stress, here is how it changes your brain

The Harvard Gazette – Health & Medicine – Eight weeks to a better brain

Center for Healthyminds – University of Wisconsin-Madison