Do you know that scientists from the University of Indiana and Rutgers University recently discovered that regular meditation can improve short-term and sustained mental health, improve the blood lipid profile, and reduce systemic inflammation (peer-reviewed study)? This follows a 2012 study from Stanley Medical College in India that found an improvement of cardiovascular health in regular meditation practitioners. To read a more user friendly breakdown of these studies and others, visit the Isha Yoga science page.
Though these studies were based upon Isha Yoga meditation practices, whatever path you follow, the important thing is to follow it consistently.