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It turns out having friends has big benefits for your health. Fascinating research shows social contact can boost your immune system and your brain power. In this episode, Michael Mosley is joined by Professor Pamela Qualter from Manchester University, who explains how reaching out in the simplest of ways - from sending a simple text to helping your neighbours - can significantly reduce loneliness levels, helping you feel more connected and a part of a community. People appreciate being contacted much more than you think. So, the next time you wonder whether to reach out to a friend – just do it.