Recruitment and methods

Approximately 65,000 participants were recruited into the EPIC-Oxford cohort between 1993 and 1999. Participation in the study required the completion of a diet and lifestyle questionnaire which consists of a food-frequency questionnaire (FFQ) as well as questions on health, family medical history and four dietary categorisation questions: “Do you eat meat?”, “Do you eat fish?”, “Do you eat dairy products?”, “Do you eat eggs?”. On the basis of the response to these four questions, each participant is categorised as either a meat-eater, fish-eater (does not eat meat but does eat fish), vegetarian (does not eat meat or fish) or vegan (does not eat any animal products).

Two methods of recruitment were used: General Practice (GP or nurse) recruitment and postal recruitment.

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