Questionnaires - Four questionnaires were completed by the adults in the NANS. These included: Health and Lifestyle Questionnaire: This questionnaire collected information on the respondent's socio-demographics, education levels, attitudes to their own diet and weight, sun exposure and supplement usage. Information on smoking status and alcohol intake was also collected in this questionnaire. In the case of married/cohabiting couples, the higher social class and education level was assigned to the respondent.