Yes, a MYTH. The “Blue Zones” is total BS. Population comparisons are worthless for nutrition science because the populations are not comparable. And no, you cannot statistically compensate for 20 varying factors unless one knew EXACTLY how much each of those factors would affect longevity.
It is just STUPID and it is shameful that people swallow that codswallop.
And that is separate from all the other BS involved in “Blue Zones”:
““Okinawan cuisine is centered around meat. The most important meat is pork. The Okinawans have a saying, that they use every part of the pig except for the toenails and the squeal. Many of the pork parts eaten are composed almost entirely of fat, such as pork skin, pig ears, and pork belly. All the internal organs of the pig are regularly eaten, such as the liver, kidneys, stomach, and intestines, which are also full of fat. Pork lard is the fat of choice for cooking, and many foods are deep fried in pork lard. Every other part of the pig is also eaten, including more familiar parts like spareribs, pork shoulder, and pork loin. The skin is usually left on and eaten whenever possible. Goat is also favored by Okinawans, though pork is far more common. What is interesting is that much of this goat meat is eaten raw, and there are restaurants that specialize in the preparation of raw goat meat” (Stanley A. Fishman, Eat Fat, Live Long: the Real Food of Okinawa).”
https://benjamindavidsteele.wordpress.com/2019/05/28/blue-zones-dietary-myth/