It exists; when I was in grade school (in the 90s) we learned about the Food Pyramid. As I recall, the base (and thus, the thing I should be eating the most of)

It exists; when I was in grade school (in the 90s) we learned about the Food Pyramid. As I recall, the base (and thus, the thing I should be eating the most of) was grains, and the top (the thing I should eat the least of) was sugar.