I always need a diagram to understand something. Sometimes I make the diagrams. For those, sometimes I’m the leader in the field, but more often I’m trying to make them for myself to understand something that pre-existed.
US Dept of Agriculture’s Food Pyramid (1992 to 2005):
USDA “My Pyramid” (2011)
So the newer one is garbage, as it conveys no simple idea. As it happens the old one was simple but not the best nutritional advice, so an upgrade was needed according to the USDA. The pyramid metaphor was powerful, so the new one had to fit that…