Background/objectives: Few longitudinal population-based cohort studies of older people have described dietary intakes over time. The objective of this study was to assess changes in the food and nutrient intake in a cohort of older Australians, using longitudinal data collected over 10 years.
Subjects/methods: Population-based cohort of people aged 49 years and over at baseline (82% of those eligible) living in two postcode areas, west of Sydney. In 1992-1994, 3654 people were examined; 2334 were reexamined after 5 years and 1952 after 10 years (75% survivors at both examinations). A 145-item food frequency questionnaire was used to assess food and nutrient intake on each occasion, and 1166 participants provided usable dietary data at all three examinations.
Results: Energy and sugar intake significantly increased among women over the 10-year period (P-value for trend <0.0001). Long-chain omega-3 fatty acid and fish intake significantly increased in both men and women (P-value for trend <0.0001). Folate intake significantly increased in both men and women (women: 325 dietary folate equivalents (DFE) vs 403 DFE; men: 346 DFE vs 425 DFE, P<0.0001). Wholemeal/grain bread consumption decreased in both men and women (P-value for trend <0.0001).
Conclusions: Many of the observed changes in diet over the 10-year period were consistent with current population dietary recommendations. Some changes, however, appear to have been due to poorer dietary choices. This information could be used to inform nutrition policy and programs targeted to older persons. These data highlight the need to identify barriers to better food choices.