Our diets can have a big environmental impact. The greenhouse gas emissions involved in producing and transporting various foods has been well researched, but have you ever thought about the water-scarcity impacts of producing your favourite foods? The answers may surprise you.
In research recently published in the journal Nutrients, we looked at the water scarcity footprints of the diets of 9,341 adult Australians, involving more than 5,000 foods. We measured both the amount of water used to produce a food, and whether water was scarce or abundant at the location it was drawn from.
The food system accounts for around 70% of global freshwater use. This means a concerted effort to minimise the water used to produce our food – while ensuring our diets remained healthy – would have a big impact in Australia, the driest inhabited continent on Earth.
Biscuits, beer or beef: which takes the most water to produce?
We found the average Australian’s diet had a water-scarcity footprint of 362 litres per day. It was slightly lower for women and lower for adults over 71 years of age.
A water-scarcity footprint consists of two elements: the litres of water used, multiplied by a weighting depending on whether water scarcity at the source is higher or lower than the global average.
Foods with some of the highest water-scarcity footprints were almonds (3,448 litres/kg), dried apricots (3,363 litres/kg) and breakfast cereal made from puffed rice (1,464 litres/kg).
In contrast, foods with some of the smallest water-scarcity footprint included wholemeal bread (11.3 litres/kg), oats (23.4 litres/kg), and soaked chickpeas (5.9 litres/kg).
It may surprise you that of the 9,000 diets studied, 25% of the water scarcity footprint came from discretionary foods and beverages such as cakes, biscuits, sugar-sweetened drinks and alcohol. They included a glass of wine (41 litres), a single serve of potato crisps (23 litres), and a small bar of milk chocolate (21 litres).
These foods don’t only add to our waistlines, but also our water-scarcity footprint. Previous studies have also shown these foods contribute around 30% of dietary greenhouse gas emissions in Australia.
The second highest food group in terms of contributing to water-scarcity was fruit, at 19%. This includes whole fruit and fresh (not sugar-sweetened) juices. It should be remembered that fruit is an essential part of a healthy diet, and generally Australians need to consume more fruit to meet recommendations.
Dairy products and alternatives (including non-dairy beverages made from soy, rice and nuts) came in third and bread and cereals ranked fourth.
The consumption of red meat – beef and lamb – contributed only 3.7% of the total dietary water-scarcity footprint. These results suggest that eating fresh meat is less important to water scarcity than most other food
groups, even cereals.
How to reduce water use in your diet
Not surprisingly, cutting out discretionary foods would be number one priority if you wanted to lower the water footprint of the food you eat, as well as the greenhouse gas emissions of production.
Over-consumption of discretionary foods is also closely linked to weight gain and obesity. Eating a variety of healthy foods, according to energy needs, is a helpful motto.
Aside from this, it is difficult to give recommendations that are relevant to consumers. We found that the variation in water-scarcity footprint of different foods within a food group was very high compared to the variation between food groups.
For example, a medium sized apple was found to contribute a water-scarcity footprint of three litres compared with more than 100 litres for a 250 ml glass of fresh orange juice. This reflects the relative use of irrigation water and the local water scarcity where these crops are grown. It also takes more fruit to produce juice than when fruit is consumed whole.
Two slices of wholegrain bread had a much lower water-scarcity footprint than a cup of cooked rice (0.9 litres compared with 124 litres). Of the main protein sources, lamb had the lowest water-scarcity footprint per serve (5.5 litres). Lambs are rarely raised on irrigated pastures and when crops are used for feeding, these are similarly rarely irrigated.
Consumers generally lack the information they would need to choose core foods with a lower water-scarcity footprint. Added to this, diversity is an important principle of good nutrition and dissuading consumption of particular core foods could have adverse consequences for health.
Perhaps the best opportunities to reduce water scarcity impacts in the Australian food system lie in food production. There is often very large variation between producers in water scarcity footprint of the same farm commodity.
For example, a study of the water scarcity footprint of tomatoes grown for the Sydney market reported results ranging from 5.0 to 52.8 litres per kg. Variation in the water-scarcity footprint of milk produced in Victoria was reported to range from 0.7 to 262 litres. This mainly reflects differences in farming methods, with variation in the use of irrigation and also the local water scarcity level.
Water-scarcity footprint reductions could best be achieved through technological change, product reformulation and procurement strategies in agriculture and food industries.
Not all water is equal
This is the first study of its kind to report the water-scarcity footprint for a large number of individual self-selected diets.
This was no small task, given that 5,645 individual foods were identified. Many were processed foods which needed to be separated into their component ingredients.
It’s hard to say how these results compare to other countries as the same analysis has not been done elsewhere. The study did show a large variation in water-scarcity footprints within Australian diets, reflecting the diversity of our eating habits.
Water scarcity is just one important environmental aspects of food production and consumption. While we don’t suggest that dietary guidelines be amended based on water scarcity footprints, we hope this research will support more sustainable production and consumption of food.
This article is republished from The Conversation under a Creative Commons license. Read the original article.
4th October 2020 at 3:48 pm
An article with a heading Biscuits, Beer or Beef and which one takes the most water to produce? Yet nowhere in the article comparing or indicating how many litres of water to produce a kilogram of each. Seems like you might be watering down the fact that it’s beef or is it?
18th November 2019 at 11:54 pm
Dear Brad Ridoutt
My name Daffa Pratama from Semarang 11 Senior High School,Indonesia.
After I read your articles,I agree with you about water that is increasingly scarce. Water content in food is indeed different because in the process of making it also requires different water. In developed countries that do not experience water scarcity can only use large amounts of water to make a food. However For countries like your country Australia, Indonesia and other countries where water scarcity occurs it would be better to reduce or consider using water in food to reduce water scarcity. Then, your opinion about the best opportunity to reduce water scarcity is also good and it is very helpful for Australians and countries in the world including my country Indonesia which occurs water scarcity. I hope to help to reduce water scarcity because in my opinion this water scarcity is very detrimental to the country experiencing the problem (water scarcity).
Thanks for the article
Love from Indonesia??????
(XII MIPA 4/14)
18th November 2019 at 9:50 pm
Dear Brad Ridoutt
My name is Daffa Pratama from Semarang 11 Senior High School,Indonesia.
After I read your article,I agree with you about water that is increasingly scarce. Water content in food is indeed different because in the process of making it also requires different water. In developed countries that do not experience water scarcity can only use large amounts of water to make a food. However,for countries like your country Australia, Indonesia and other countries where water scarcity occurs it would be better to reduce or consider using water in food to reduce water scarcity. Then, your opinion about the best opportunity to reduce water scarcity is also good and it is very helpful for Australians and countries in the world including my country Indonesia which occurs water scarcity. I hope to help to reduce water scarcity because in my opinion this water scarcity is very detrimental to the country experiencing the problem (water scarcity).
Thanks for the article
Love from Indonesia??????
(XII MIPA 4/14)
10th November 2019 at 9:19 pm
Dear Brad Ridoutt,
My name Alfito Pramadia from Eleven Senior High shcool Semarang,Indonesia. I learned something after reading your article, that knowing the content in food is important, and the more advanced it is today the process of making food needs to be considered. Because making food also requires ingredients, especially water. In some countries that have dry conditions the use of water must be considered. therefore the development and research of technology in the food sector must also be in accordance with the conditions of the region, so that water scarcity will not occur.