Interest in vegetarian diets is growing due to health and animal welfare concerns. This study examined the experiences of individuals who adopted vegetarian diets as adolescents or adults. Nineteen self-identified adult vegetarians, recruited from a vegetarian group in one city using snowball sampling, participated in qualitative interviews. The majority of respondents were well-educated, middle-class adults of European-American backgrounds, although they varied in age and sex as well as type and duration of vegetarian diet. The constant comparative method was used for analysis of these qualitative data. A process model describing the adoption of vegetarian diets was developed. Two types of vegetarians, health and ethical, were identified based on respondents' major reasons for adopting a vegetarian diet. Health vegetarians were motivated by a perceived threat of disease and the potential health benefits associated with Vegetarian dirts. Ethical vegetarians were motivated Ly moral considerations and Viewed a vegetarian diet as a way to align dietary behaviors with beliefs and values about animal welfare. Adoption of a vegetarian diet was influenced by the receipt of information about the health and ethical impacts of vegetarian diets, physical aversions to animal-derived food, and hfe transitions. These findings can assist nutrition educators in developing strategies to work With clients adopting vegetarian diets and expand understanding of food choice behavior.