A new metareview published in the highly-respected JAMA Psychiatry reveals that even modest exercise (less than recommended by public health guidelines) can have a major impact on mental health. Just 2.5 hours a week of brisk walking was related to a 25% lower risk of depression–and the biggest benefits were seen when moving from none to some activity (rather than moving from moderate to high levels of exercise). The researchers argued that one in nine cases of depression might be prevented if everybody in the population was active at current recommendation levels.
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