Here, at Free the Animal, are three scatterplots that show better health (less heart disease, less stroke) correlated with more saturated fat (= animal fat) in the diet. Each point is a different European country (Albania, Bulgaria, etc.). Small and large countries show the same relationship.
The obvious confounding is with wealth — rich people eat more meat than poor people. Were this data submitted for publication, I imagine someone would say how dare you fail account for that! and reject the paper. That would be a mistake. Because it is hard to look at this data and continue to think that saturated fat is the evil it is made out to be. And of course whatever the weaknesses of my sleep/fat experiment (which showed animal fat improved my sleep), confounding with wealth was not one of them.