I'm certain I have an article, filed into oblivion though, that discusses how the four food
groups were invented by the Canadian?American? Dairy Council.  Food for thought.

Genevieve Courant RN MSc(Nutrition) IBCLC

whose two children never would nor were pushed to drink cow's milk (who would after years of the
good stuff?); whose mushroom loving husband feels there ought to be a "fungus group"...

Sudbury, Canada