A "picaterian" is a person that eats anything other than what a true vegetarian eats. A true vegetarian only eats from plant-based, fungi-based, or algae-based food source. The terms ovo-vegetarian, lacto-vegetarian, ovo-lacto-vegetarian, and pescatarian are not valid vegetarian diet options. Vegans also eat a vegetarian diet. "Pica," the root word for picaterian comes from the is a medical disorder, "Pica." "Those with Pica have an appetite for substances largely non-nutritive (e.g., metal, clay, coal, sand, dirt, soil, feces, chalk, pens and pencils, paper, batteries, spoons, toothbrushes, soap, mucus, ash, gum, etc.; or an abnormal appetite for food ingredients (e.g. flour, raw potato, raw rice, starch, ice cubes, salt)."