In the 60s, the town of Rosteo, Pennsylvania has statistically significantly fewer heart attacks and heart disease than surrounding towns that on their surface looked identical. The odds were against them; they worked difficult blue-collar jobs, ate fatty foods, and even smoked cigars. The one difference: Roseto was founded by recent Italian immigrants, and they embraced their old tight-knit community ways of living life. Evidence from the Roseto Effect is clear—if you have unconditional love and belonging in a tribe, practically every other lifestyle choice you make is a rounding error to your health, happiness, and longevity.