Australia: ancient food knowledge, migration and a modern metabolic environment
Australia combines the world’s oldest continuing Indigenous cultures with industrial agriculture, highly urbanized living and migration from nearly every country. Its metabolic-health burden therefore cannot be described by one diet or one population. Aboriginal and Torres Strait Islander communities, long-established Australian families and newer migrants encounter the same commercial food system through different histories, resources and biological backgrounds.
Australia at a glanceAIHW estimates that in 2022–24 about 67% of adults—13 million people—were living with overweight or obesity.About 27% of children aged 2–17—1.4 million children—were living with overweight or obesity.Among First Nations adults in the measured 2022–23 survey, 72% had overweight or obesity and 44% had obesity.Among First Nations children aged 2–17, 30% had overweight or obesity and 10% had obesity.In 2022, 29.5% of Australia’s residents were born overseas; England, India, China and New Zealand were the largest overseas-born groups.
First Nations food systems are diverse rather than a single “bush food” diet. Across desert, tropical, river and coastal Country, communities developed detailed knowledge of seasonal plants, seeds, tubers, fruits, insects, game, fish and shellfish. Food knowledge is connected to Country, kinship, ceremony, land management and trade.
Colonization disrupted access to Country, water and customary food practices. Rations and institutional food systems introduced refined flour, sugar and other shelf-stable products, while dispossession and economic exclusion changed the conditions in which food could be produced and shared. Contemporary health patterns must be understood in that history, alongside housing, income, food prices, transport, racism and access to culturally safe care.
Inherited variation can influence insulin secretion, body-fat distribution, lipid metabolism and urate handling. No single “Aboriginal obesity gene” explains current disparities, and ancestry must never be used as a diagnostic shortcut. Australia’s major rise in obesity occurred within a few decades—far faster than population genetics could change.
Gene–environment interaction is still clinically relevant. The same food exposure can produce different glucose, liver-fat or urate responses between individuals. That supports individualized screening and research conducted with Indigenous governance; it does not support ranking cultures by presumed genetic risk. The strongest population evidence points to the combined effects of commercial food exposure and unequal social conditions.
In remote communities, nutritious food can be constrained by freight, storage, refrigeration, extreme heat, flooding and small retail markets. Shelf-stable refined foods and sugary drinks may be cheaper, more reliable or more heavily promoted than fresh produce. AIHW reports lower overweight and obesity prevalence among First Nations adults in very remote areas than in major cities, showing that remoteness does not create one simple pattern.
Community-owned stores, freight support, reliable water, cold-chain investment and local food production are health infrastructure. Policies should be evaluated by food price, availability, sales patterns and health outcomes—not by whether individuals received another education campaign.
Australia’s native foods—including wattleseed, native fruits, leafy plants and regionally specific animal and seafood foods—can support cultural continuity, land management and Indigenous enterprise. Commercial expansion should protect Indigenous knowledge and ownership rather than extracting products from the communities that maintained them.
Australia is also a major producer and exporter of grains, meat, dairy, fruit, vegetables and seafood. As in New Zealand, high national production does not guarantee affordable, nutritious diets for every household. Supermarket access, regional transport, household income and the marketing of discretionary foods shape the domestic plate.
Australia’s immigrant population is not one health category. Migrants arrive from South Asia, East and Southeast Asia, the Pacific, the Middle East, Africa, Europe and the Americas, with different dietary traditions, socioeconomic circumstances and baseline health profiles.
Many migrant groups initially show a “healthy migrant effect,” but international and Australian studies find that obesity risk can rise with longer residence in a high-income food environment. Possible influences include changing work patterns, time pressure, car dependence, larger portions, sugary drinks and inexpensive ultra-processed foods. The evidence is mostly observational and varies by community; it should not be turned into stereotypes.
Useful services retain the strengths of heritage diets, provide information in relevant languages and recognize that BMI thresholds and cardiometabolic risk may not align identically across ancestries. Screening should consider waist circumference, glucose or HbA1c, blood pressure, lipids, liver health and family history.
Most Australian school food still comes from home or canteens rather than a universal meal system. The National Healthy School Canteens framework encourages schools to make nutritious foods more available and limit confectionery, sugary drinks and energy-dense products. Implementation differs across states, territories and schools.
School policy can go beyond nutrition education by addressing drinking-water access, canteen standards, marketing, food insecurity and procurement from local and Indigenous suppliers. Evaluation should include what children actually eat, affordability, waste and participation.
Australia’s National Obesity Strategy 2022–2032 treats obesity as a complex population-health issue and identifies Aboriginal and Torres Strait Islander people as a priority population. Durable progress requires coordinated action across food retail, transport, schools, primary care, agriculture and community-controlled health services.
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