In a word, yes! According to Astin and other researchers from the Harvard Medical School and the California Pacific Medical Center:
Their review of the research finds considerable evidence of efficacy for mind-body therapies in the treatment of coronary artery disease , headaches , insomnia, incontinence, improving postsurgical outcomes, chronic low back pain , and disease and treatment-related symptoms of cancer , as well as moderate evidence of efficacy for mind-body therapies in the areas of hypertension and arthritis .
Many studies show great potential for improved health outcomes. For example:
The best way to find evidence is to search PubMed  for a specific mind-body therapy or practice.
Although mind-body research is constantly evolving, some characteristics of these therapies make them more difficult to study than, say, standard drug treatments. This can influence the attitude of the mainstream medical world towards these therapies. It also raises interesting questions about the nature and reliability of all medical research. For example, mind-body therapies and practices:
Sometimes it is also difficult for researchers to interpret outcomes from mind-body therapy research because:
You have probably heard about drug trials where some of the participants are given a new drug and some are given a placebo - a substance that looks like the drug, but has no active ingredients. The drug company is hoping that their drug will show more benefit to patients than the placebo. While it might seem obvious that the drug would show more benefit, in some cases (particularly in some cultures), the placebo effect is so strong that that the difference is slight. What this means is that the patient's expectation of a desired outcome actually causes it to occur, not the drugs.
Many mind-body therapies deliberately employ this so-called placebo effect to initiate the self-healing capacities of the individual. In this context, the placebo is not an unintended or negative outcome. Rather, it is another example of how the mind (which creates meaning) can impact the body.
In an extensive review of the clinical research, top researchers Walach and Jonas concluded that the placebo effect is real and that healthcare providers should seek to use it to benefit their patients. A 2010 meta-analysis confirmed that the placebo effect is useful for subjective measures, such as pain and nausea.
In addition to this study on stress and aging, there is much important research on the mind-body connection. The PDF available on this screen lists key studies, historical and current on the physiology of the mind-body connection. (It does not list research on specific mind-body practices.)
Click for PDF listing key studies.