To put this another way, they are now telling us that their last round of advice is killing us. It's difficult to see how this could be called expert advice. Dietary recommendations vary so much from country to country that it appears health authorities are not talking about different nationalities, but different species. The recommended salt intake in Germany is 10 times that of neighbouring Poland. The recommended maximum alcohol consumption in France is nine times that of Sweden.
Similar chaos exists over fat.
Recommendations to reduce our intake of dairy products are countered by statements suggesting that dairy products are just fine. The condemnation of meat is hotly disputed by the hired guns of the meat industry. Cereal companies do a brisk business by promoting the largely discredited view that fibrousness is next to godliness. Walter Willett is a professor of medicine at Harvard University and was one of the scientists whose work was fundamental in constructing a dietary pyramid that has become a widely recognised guide to nutritional values. He now warns that following this model is misguided and may even be dangerous.