I think all that statistical analysis is a load of crap. As far as I can tell, at this point in history all nations have the same death rate when all is said and done: 100%. Everyone dies of something eventually. Telomere rejuvenation and other treatments may change this any day now, in which case humanity must take a serious look at our systematic over-reproduction tendencies, eh? There are over twice as many people now as when I was a child, and 7x as many as when my grandfather was young, despite the flu pandemics and world wars and genocides. Since my family has been the same size for the last 120 years, I blame others for the depredation of the planet, so there. Too many people!
Meanwhile, in hybrid cultures such as Scotland, you have people who are part celt, part norse, and may have some arctic/sami metabolism genes floating about as well, especially in the northern reaches and isles, thanks to interbreeding with norwegians, etc. Arctic cultures tolerate and thrive at much higher levels of fat and protein in their diet (up to 60% fats in some eskimo/inuit tribes!), and data regarding life expectancy is always clouded with higher rates of infant/child mortality and poor medical facilities available at all ages. For those who think that cold climate alone is responsible for indigenous lifespans... piss off! We can take the cold. One of my mother's uncles was a locksmith after he was 70 and still went out to unlock cars and otherwise help folk in the deep of Chicago winters when he was 96, no problem. I wear shorts and a t-shirt with a light jacket when it's below 0°C. It's the deadly breads/complex carbs that hurt us, but governments don't talk about that because grain-carbs are cheap feed for big cities, which means more taxes. What are we, cows?
Because the specialized metabolic patterns of ancient tribes have been so mixed in modern times, I think each person has to discover for themselves what makes their body work. Some people can live to 100 eating bacon and eggs and steak every day, with a generous dose of pipe-smoking alongside, while others need to concentrate on fruits and veggies and watch their cholesterol like a hawk.
Personally, I think that quality of life and total fitness is worth a lot more than any 1 factor, and worth more than total longevity. Averages are about bragging rights; they don't address quality of life. If deep-fried foods keep you active and alert and in shape, that's fabulous. Enjoy! If apples and spinach are what you need to stay trim and moving, then go with that instead. Total health is a personal path, not one guaranteed by following statistics and government guidelines based on averages. A good day's work and some aerobic workout is worth more than a hundred subtle factors with thresholds below statistical significance.
In case you didn't realize it, I DO have a sense of humor. How about you?
"I will not fear. Fear is the mind-killer... I will face my fear. I will let it pass over and through me, and when it has gone, only I will remain." --The Bene Gesserit
"Time is a spiral. Space is a curve. I know you get dizzy, but try not to lose your nerve." -- Neil Peart
"I'm not in the ship. I am the ship." -- River Tam
"The truth is simple. It's the lies that get complicated." -- me
"No matter where you go, there you are." --Buckaroo Banzai