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There are seventeen sets of colour photographs (nineteen in version 3 of the 7DD used in the third health check 2009) showing different portions of a range of different foods. Participants can use these where appropriate to help them quantify foods. For example, when consuming cornflakes or other breakfast cereals they might select photograph 1c to match the amount they consumed.
The 7DD has been used at 3 time points in the EPIC-Norfolk study so
far; at the first health check (1HC) collected from 1993-1998; the
follow up study (FU) 18 months after the 1HC; second health check (2HC)
four years after the 1HC and currently food diaries are being given to
participants attending a third health check (3HC).
At the 1HC, the diary layout was explained to participants by a nurse and standardised instructions given on how to fill it in. To help this process the participant was asked to recall the previous day's intake from waking to going to bed, and the details written into the first day of the diary. The following six days were completed at home and diaries returned in a Freepost envelope.
At further time points diaries were sent out or given out to participants with reminders as to what was needed and to encourage adequate records. |
