I have a hobby. When I see a healthy patient over 90 years old, I always ask them about their diet, and the answer is almost always the same: They lean over and, sounding a little guilty like the kid who got caught with their hand in the cookie jar, say something like,
"Well, I hate to tell you this, but I have eaten butter, eggs and bacon all my life."At which point I ask the female patients about their pie cooking - and they all agree they used lard.
Now this is not a rigorous scientific study, but I have been doing this for over 20 years, and the observation is remarkably consistent. The important fact, in my opinion is not what they ate, but what it implies about
what they didn't eat:
They did not switch to margarine. They did not use Crisco for cooking. They did not wallow in corn oil. In short, they ate natural fats, not manmade ones. In their heartland, meat and potatoes, home-cooked diet, the ratio of Omega 3 to Omega 6 oils was generally high.
I hate to keep denigrating the food pyramid, but it deserves denigrating, and once again with regard to intake of "fats." For at least 40 years, the policy wonks have pushed a low-fat diet, also promoting "heart-healthy" margarines in place of butter, and have recommended more complex carbs overtly as well as covertly (in most low-fat foods, artificial lab-derived filler carbs give the food "substance," so low-fat foods are generally high-carb foods).
During this reign of the government nutritionists, Americans have become more obese with more diabetes, metabolic syndrome and Alzheimer's dementia. The recommendations persist even in the face of massive data showing that oils derived from plants such as soybeans and corn - i.e. Omega 6 oils - create inflammation in the body and contribute to disease.
Comment: For more information on the inflammatory foods which are best avoided, see:
The Dark Side of Wheat - New Perspectives on Celiac Disease and Wheat Intolerance
Opening Pandora's Bread Box: The Critical Role of Wheat Lectin in Human Disease
The Obesity Epidemic, Courtesy of the Agricultural Industry
Why Milk Is So Evil