PESCO-,POLLO-, AND SEMI-VEGETARIANISM In the Church of Veggie, these are the Unitarians. Pesco-vegetarians eat fish (because fish don't have sophisticated nervous systems). Pollo-vegetarians eat chicken (because, well, they just like chicken). The newest phylum is the semi-, for people who frequently but not systematically avoid meat and dairy. These three forms may represent a healthy diet, but they are not, strictly speaking, vegetarian.