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Yoga does the body good, and according to a new study, it may ease the mind as well.

Yoga has also become such a cultural phenomenon that it has become difficult for physicians and consumers to differentiate legitimate claims from hype, researchers from Duke University Medical Center write in their study, published in the journal Frontiers in Psychiatry. In order to explore the widely held belief that practicing yoga can relieve mental stress, the team reviewed more than 100 studies on the effect of yoga and mental health.

Most individuals already know that yoga produces some kind of a calming effect. Individually, people feel better after doing the physical exercise, says lead study author Dr. P. Murali Doraiswamy, a professor of psychiatry and medicine at Duke University Medical Center. Mentally, people feel calmer, sharper, maybe more content. We thought its time to see if we could pull all [the literature] together to see if theres enough evidence that the benefits individual people notice can be used to help people with mental illness.

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Their findings suggest that yoga does in fact have positive effects on mild depression and sleep problems, and it improves the symptoms of psychiatric disorders like schizophrenia and ADHD among patients using medication.

The researchers focused on 16 studies that recorded the effects of practicing yoga on mental-health issues ranging from depression, schizophrenia, ADHD, sleep complaints and eating disorders to cognitive problems. They found positive effects of the mind-and-body practice for all conditions with the exception of eating disorders and cognition. Those studies involved too few participants or produced conflicting results to draw any meaningful conclusions.

Some of the studies included in the analysis even suggested that yoga might affect the body in ways similar to antidepressants and psychotherapy. For instance, yoga may influence brain chemicals known as neurotransmitters (boosting levels of feel-good agents like serotonin), lower inflammation, reduce oxidative stress and produce a healthier balance of lipids and growth factors just as other forms of exercise do.

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Embracing yoga as a complementary treatment for mental disorders is not uncommon. Yoga is a feature in many veterans centers throughout the country, backed by research funded by theDepartment of Veterans Affairs. The Huffington Post reported that many troops use yoga as a form of treatment for PTSD, for example, with companies like Warriors at Ease training instructors in yoga techniques specifically catered to those in the military. A study published earlier this month of 70 active-duty troops found daily yoga eased anxiety and improved sleep.

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Yoga and the Mind: Can Yoga Reduce Symptoms of Major Psychiatric Disorders?