http://www.experiencelifemag.com/issues ... ession.phpResearchers have assessed modern-day hunter-gatherer bands — such as the Kaluli people of the New Guinea highlands — for the presence of mental illness, and they found that clinical depression is almost completely nonexistent among such groups.
Despite being much more likely to experience tragic events like the death of a child or a crippling illness, and living with none of the material comforts or medical advances we take for granted, they’re largely immune to the plague of depressive illness.
But how are hunter-gatherers able to weather life’s storms so effectively? Based on the available research, it seems that the hunter-gatherer lifestyle is profoundly antidepressant. As they go about their daily lives, they naturally wind up doing things that keep them from getting depressed, things that change the brain more powerfully than any medication. These range from exercising regularly and eating plenty of omega-3 fats to belonging to active social networks and getting enough sleep.
Probably one of the better research articles in to mood disorders I've read this year.
