A study by researchers at the Boston University School of Medicine has added more evidence to support the psychological benefits of yoga. Participants in their study were divided into two groups. One group practiced yoga three times a week for an hour while another group walked for the same length of time. The participants were asked about their mood and levels of anxiety throughout the study and the researchers measured the levels of a substance called GABA in their brains, low levels of which are associated with depression and anxiety. Those who practiced yoga reported a more significant decrease in anxiety and greater improvements in mood than those who walked and over time positive changes in the participants' mental states - whether they walked or did yoga - were associated with increased levels of GABA.
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