100% Vegetarian Fed. What this really means is that these chickens have been fed a diet of pesticides and genetically modified foods and are lacking some natural protein in their diet. Chickens have been designed to forage for their food, eating lots of bugs. If chicken is not certified organic, it has been supplemented GMO corn and soy which is “Round-up Ready” containing glyphosate. Chickens, nor humans were designed to ingest these types of chemicals. Dr. Mercola has several articles warning about the dangers of glyphosate.