Vegetarian

A vegetarian is a vampire or a hybrid who subsists on animal blood rather than human. The term was adopted by the Cullen family, so that they could refer to their unnatural diet in a civilized fashion. Being a vegetarian is very uncommon among vampires because animal blood is less appetizing than human, and the majority consider it somewhat unusual; the only two covens consistently showing this diet are the Olympic and Denali covens. Nevertheless, being a vegetarian allows vampires to live among humans with little or no detection, even though it can only be accomplished in regions with ample animal populations. In some cases, such vampires can live not only as a coven but as a family as their needs do not always drive them to kill. By feeding on animals, they retain the ability to resist the urge to consume humans.

Vegetarians have golden rather than red eyes. The vegetarian diet is much less appealing than human blood and, at times, it is too strong for a vampire to resist the latter. In the Twilight movie, Edward states that "It's like a human only living on tofu, it keeps you strong, but you're never fully satisfied".

The Olympic Coven

 * Carlisle Cullen
 * Esme Cullen
 * Edward Cullen
 * Bella Swan
 * Alice Cullen
 * Jasper Hale
 * Rosalie Hale
 * Emmett Cullen
 * Renesmee Cullen

The Denali Coven

 * Tanya
 * Kate
 * Carmen
 * Eleazar
 * Garrett (Turned vegetarian when he joined the Denali Coven)
 * Irina ♰
 * Laurent ♰ (Secretly drank human blood occasionally)

Trivia
In the movie adaptation of Twilight, Carlisle uses the term "vegetarian" to describe Jasper, and why he acts distant towards Bella when she comes to the house. Edward also says that he doesn't feed on humans because "he doesn't want to be a monster", and he mentions that they do call themselves vegetarians at times.