Second blood samples

A subset of participants who had given an initial blood sample and completed a follow-up questionnaire were asked to provide a second blood sample. Participants were selected by age, sex and diet group. 1,000 second blood samples have been collected and stored frozen in liquid nitrogen, until they are required for laboratory analysis. The main purpose of these repeat blood samples is to assess the stability of blood levels of, for example, vitamins, fats and other nutrients.

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