Which historical visual guide in the US contributed to the belief that eggs belonged in the dairy section?

Answer

The food pyramid guidelines

A notable historical source of confusion, particularly in the United States, stemmed from the previous iterations of the food pyramid guidelines. Many individuals recall being taught through that visual guide that eggs should be grouped within the dairy section. This institutional education, combined with the consistent placement of eggs in the refrigerated dairy aisle in supermarkets, created a powerful cognitive shortcut that overshadowed the biological reality that eggs are poultry products, not milk derivatives.

Which historical visual guide in the US contributed to the belief that eggs belonged in the dairy section?
foodclassificationnutritiondairyegg