I know nothing about the specifics, but the quality of produce at the supermarkets is light years better in the EU than in the USA, in my personal experience.
My favorite thing to do when I visit a different country is tour the grocery store. I compare the price of milk, bread, eggs, cheese, and beef.
In Italy and London I have found that similar quality products are much more expensive usually. However the stores caring more high quality local foods, and less of the cheap processed foods that we American's love.
