This BBC Health video clip explores meditation, focusing on the challenge researchers face as they attempt to
pinpoint cause-effect relationships when studying the impact of alternative therapies on health outcomes.
Renowned Harvard University scientist Herbert Benson, who first described the relaxation response, treats his
patients holistically with dietary modifications, exercise, as well as meditation. Although often effective, for
some patients, and some conditions, there are so many factors involved in this type of intervention that it is
difficult to prove whether any one, such as meditation, is effective. The video clip explores the evidence base
for meditation, including the benefits of meditation for people suffering from asthma, chronic pain, and heart
disease.