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Scientists have proven than soil microbes have similar effects on the brain as Prozac, making ‘getting dirty’ a natural antidepressant. You want happier, more laid-back children? Send them outside and tell them to get dirty.
People that spend time in the dirt, such as kids and avid gardeners, inhale the bacteria, have topical contact with it and get it into their bloodstreams when there is a cut or other pathway for infection.
So the next time your kid wants to play in the mud, encourage him do so. You can always wash away the dirt, but the natural effects of the soil bacteria antidepressant can be felt for up to 3 weeks if the experiments being done are any indication.
Source: matadornetwork.com