Hi Mineralman,
Japanese eat a low fat diet, but they eat a lot of fish, green tea, and sea vegetables. Often those promoting a low fat diet say look a the Japanese. Well, the Japanese also smoke a lot more than Americans. One could just as easily ascribe long Japanese life spans to smoking as they could to eating a low fat diet. So one should not expect to achieve a Japanese long life just by eating a low fat diet, American style, without all the other dietary factors which more probably result in a long life span.
http://www.okicent.org/
http://www.okicent.org/study.html
http://www.wonder-okinawa.jp/026/e/pork.html
Okinawa, island of pork.
http://health.howstuffworks.com/life-expectancy.htm
Andorra (between Spain and France) has the longest life expectancy in the world.
http://organizedwisdom.com/helpbar/.../news/4484.html
This study puts Spanish life expectancy at over 80, with regions at 81. I had another link I will look for which now estimates overall Spanish life expectancy to be 82.
Switzerland and Australia also are at 82. So any of Andorra, Spain, Switzerland, Australia are just as good as Okinawa as role models for long life. France is close.
Bottom line - there appears to be nothing wrong with eating animal products. Just the opposite is true. Those nations with access to meat and fish live the longest, far longer than those with vegetarian diets. There also is no correlation to eating low saturated fat, and living long. All of those countries, with the exception of Japan, eat a lot of saturated fat in their diet. And the Japanese who do live the longest? Okinawans, who live on "The Island of Pork".
Now, any diet which works for you - meaning gives you correct body weight (fat loss for many of us), good blood pressure, good pulse rate, and gives you good energy levels - is by actual measurement a good diet.
If Paleo does this for you, then by all means eat Paleo. If eating cheese does this for you, then eat cheese. I doubt eating vegan will give anyone good health in the long run.