Are Blue Zones Of Longevity Based On Bad Data?

"The Blue Zone Distraction". 

Summary: Blue Zones -- geographical regions that supposedly have the world's most long-lived people -- are dubious. Whether it's Sardinia, Okinawa, or Greece, the numbers of old people are wrong, due to census mistakes or "pension fraudsters". These errors propagate false claims about the benefits of wine-drinking or plant-based diets. Researchers seriously interested in longevity must look for better data.