Mary: "A cheeseburger delux, hold the lettuce, tomato, coleslaw, and pickle."
Waiter: "So you just want the burger and fries."
Mary: "Yep, I'm a meatatarian."
The reason for this is that people need many nutrients from a variety of sources, including fish, milk, meat, vegetables, oils, and fruits. If someone were to eat only meat they would be not only malnutritioned, but probably overweight and out of shape from the excessive saturated fat within the meat.
After all, red meat is known to just be empty calories with protein.
This word appeared in a Wendy's commercial.