Dietary intake assessment for clinical trials has required using largely outdated food composition data absent of fatty acids until the recent release of the AUSNUT2007 database. The aim of this study was to convert clinical trial diet history and food record data from AUSNUT1999 to AUSNUT2007.
A systematic approach was required to convert t=0,3,6,12 month diet history and t=0,1,2, 3,6,9,12 month food record data from the SMART trial (ACTRN12608000425392). FSANZ matching files were used to transfer direct food matches based on unique identification code. Following this, 1999 ‘Not Further Specified’ (NFS) foods were matched to 2007 ‘Not Specified’ (NS) foods. As meat cuts and cooking methods differed substantially, relevant industry bodies were contacted for popular cuts and cooking methods or a recipe was created. The remaining foods were matched by conceptual and nutrient similarities using professional judgement. A macro was written using MS Excel to standardise the process. Where a match was not appropriate a recipe was created. Actual recipes from the trial were then converted individually.
A total of n=8232 reported foods were converted at t=0 for the diet history. Of these n=635 individual foods were directly matched using the matching file and n=979 required professional judgement.
Use of AUSNUT2007 food composition data has allowed for individual fatty acid data to be obtained without re-entering all dietary records into a smaller separate database. Converting the data provides a greater understanding into the new database including its limitations for future analyses.