We know a poor diet can have severe outcomes on our waistline but they can also have important impacts on the environment too.

The challenge

Poor diets affect more than just our health

Australian's poor diets are growing the nation's waistlines and contributing to health issues but global food systems cause major impacts on the environment as well. Changes from the plate up, are being considered internationally as a leading strategy to lessen environmental impact.

Discretionary or "junk" foods, such as alcohol, confectionery, fried foods and processed meat are high in kilojoules, but low or completely lacking in essential nutrients. Australia's overconsumption of discretionary foods is not good for the planet, and contributes to a major source of greenhouse gas emissions.

The food demand of a growing population places great pressure on the environment. The food system is estimated to account for between 19 and 29 per cent of global greenhouse gas emissions, and around 70 per cent of global freshwater use.

Emissions from discretionary foods are considered 'avoidable' because they are not a necessary part of a balanced diet. However, just cutting out discretionary food would leave many diets energy deficient. Australians generally need to reduce their intake of discretionary foods and increase core foods. Eating according to dietary guidelines will help to reduce population dietary greenhouse gas emissions.

Our response

Plugging a research gap

Our researchers, Bradley Ridoutt, Gilly Hendrie and Manny Noakes, conducted a literature review about dietary strategies that can reduce environmental impact.

Info-graphic consisting of a grid of boxes (six by three) numbered 1 to 17, each with an icon and text related to one of the UN sustainable development goals.

Information for each goal includes:

  1. No poverty (people icon)
  2. Zero hunger (steaming food bowl icon)
  3. Good health and well-being (heart rate icon)
  4. Quality education (pen and book icon)
  5. Gender equality (male and email symbol icon)
  6. Clean water and sanitation (water in tank icon)
  7. Affordable and clean energy (sun and power on button icon)
  8. Decent work and economic growth (upward indicating graph icon)
  9. Industry, innovation and infrastructure (three stacked cubes icon)
  10. Reduced inequalities (equal sign in circle icon)
  11. Sustainable cities and communities (city scape icon)
  12. Responsible consumption and production (infinity symbol icon)
  13. Climate action (globe in eye shape icon)
  14. Life below water (fish under water icon)
  15. Life on land (tree and birds in flight icon)
  16. Peace, justice and strong institutions (dove with olive branch carrying gavel icon)
  17. Partnerships for the goals (five interlocking circles icon)

The final box contains the UN logo and the words Sustainable Development Goals.

UN Sustainable Development Goals

The United Nations' Sustainable Development Goals mention 14 discrete environmental concerns that need to be addressed. As an example, of the 93 journal articles addressing environmental assessment of diets, only one study assessed data in relation to fish stocks.

Greenhouse gas emissions are important to consider but we also need to look beyond emissions because it is well known that efforts to reduce one environmental impact can very often exacerbate others. Current research on environmental impact lacks a holistic view.

The results

What can we do to work towards a low-environmental diet?

Although more research is needed about low-environmental diets in Australia, the researchers recommend three ways to reduce your diet's environmental impact:

  1. Know your serving size and stick to it
    Over-eating is a form of food waste. Data suggests that greenhouse gas emissions are positively correlated with total energy intake – that is, the larger the portion size, the higher the greenhouse gas emissions. The super-sizing phenomena has considerably impacted the environmental footprint and doesn't do any good for your body, or the environment. It's time to re-think the value and amount of resources that go into our food.
  2. Eat according to your needs
    Another key recommendation is to eat according to the Australian Dietary Guidelines. This means discretionary food intake is reduced to ensure adequate nutrients by increasing core foods. This addresses excess energy and food overconsumption. A nice tagline is to 'eat to your needs'. Try the CSIRO Healthy Diet Score to see how your diet habits measure up against the Australian Dietary Guidelines.
  3. Reduce food waste and only buy as many groceries as you need
    Although it isn't a dietary strategy, reducing food waste is an immediate way to ensure we aren't wasting resources. Some handy tips are to plan your meals, and use a shopping list when going to the supermarket. Food wastage directly relates to environmental impact because of the amount of energy and resources that are needed to go into making that piece of food. In Australia alone, it's estimated that food makes up 35 per cent of household and council waste

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