Michael Mosley goes in search of the evidence behind some of the most popular complementary and alternative medicines.

 Mindfulness teaches you to let go of distracting or negative thoughts and focus on the present moment. One idea as to how this might be beneficial is that the practice might help you address unwanted or negative thoughts before they begin to escalate in ways that can affect your mental health.

But can something as simple as mindfulness actually cause measurable changes in brain activity?

Dr Peter Malinowski, Reader in Cognitive Neuroscience at Liverpool John Moores University demonstrates with a test on Michael.

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