Household factors associated with older Australian's purchasing a varied diet: Results from household expenditure data

Objective: To examine the household factors associated with older Australian's (aged 55 years and over) purchasing a varied diet. Design and methods: National cross-sectional survey. Setting: All states and territories of Australia. Subjects: A total of 1898 households headed by adults aged 55 years and over. Main outcome measures: Food diversity was measured using the Dietary Variety Score (DVS). The DVS is the total number of food items purchased within a two-week period, from a possible 110 individual food expenditure items. Data analysis: Negative binomial regression was used to examine the association between the respondent's individual and household characteristics with the DVS, after controlling for all factors in the model. Results: Among the demographic factors, living arrangements, age and education are found to be associated with dietary diversity. Lone males, lone females, and households headed by people with no secondary school education, or aged over 75 years were most likely to experience lower levels of dietary diversity. Conclusions: The finding that both poor education and low income in old age are associated with dietary diversity suggests the need for early life-course interventions to improve nutritional outcomes. Nutrition education programs that also focus on those with poor education and low income, as well as lone person households and those aged over 75 years, may improve nutritional wellbeing, and thereby reduce public health costs.