Press Release 035/2017

A Fifth of the World’s Food Is Wasted

International Study on the Global Food System: Overeating and “Throwaway Mentality” Re-duce Global Food Security and Damage the Environment
2017_035_Ein Fuenftel aller Lebensmittel wird verschwendet_72dpi
Almost half of harvested crops is lost through overeating, waste, and inefficient production processes. (Photo: Markus Breig, KIT)

39 percent of adults worldwide are overweight, 13 percent even obese – with the trend increasing, says the World Health Organization (WHO). At the same time, 795 million people are starving. Still, 1.3 billion tons of food are thrown away every year according to the Welthungerhilfe. Almost 20 percent of the food made available to consumers worldwide is lost through overeating or waste alone. This is the result of an international study, in which climate researchers of Karlsruhe Institute of Technology (KIT) were involved. 


The world population consumes around ten percent more food than it needs for healthy nutrition, the researchers point out in their study. Nine percent of the food are thrown away or left to spoil. Efforts to reduce these losses could improve global food security, while ensuring everyone has access to a safe, affordable, nutritious diet, and help prevent damage to the environment. 


To quantify the extent of losses, geoscientists and climate researchers from the United Kingdom, Germany, and Australia studied all stages of the global food system, from the growing and harvesting of crops to food consumption. For this purpose, they evaluated data collected primarily by the UN’s Food and Agriculture Organization. 


They found that almost half of harvested crops worldwide, or 1.2 billion tons, are lost through overconsumption, waste, and inefficient production processes before the food even arrives at the consumers.


The least efficient process is livestock production, the researchers say. Here losses amount to 78 percent or 840 million tons. More than one billion ton of harvested crops are used to produce 240 million tons of edible animal products, including meat, milk, and eggs. This stage alone accounts for 40 percent of all losses of harvested crops, researchers say. 


Increased demand for some foods, particularly meat and dairy products, would decrease the efficiency of the food system and could make it difficult to feed the world’s expanding population in a sustainable way, the researchers emphasize. 


Meeting this demand could cause environmental harm by increasing greenhouse gas emissions, depleting water supplies, and causing loss of biodiversity. Encouraging people to eat fewer animal products, reduce waste, and not exceed their nutritional needs could help reverse these trends.


“This study highlights that food security has production and consumption dimensions that need to be considered when designing sustainable food systems. It also highlights that the definition of waste can mean different things to different people,” say Professor Almut Arneth and Professor Mark Rounsevell of KIT, who were involved in the study funded under the EU project LUC4C coordinated by KIT. 


The study was directed by the University of Edinburgh and carried out in collaboration with Karlsruhe Institute of Technology (KIT), Scotland’s Rural College, University of York, and the Centre for Australian Weather and Climate Research. It is published in the journal Agricultural Systems.  


Peter Alexander, Calum Brown, Almut Arneth, John Finnigan, Dominic Moran, Mark D.A. Rounsevell: Losses, inefficiencies and waste in the global food system. Agricultural Systems, 2017. DOI: 10.1016/j.agsy.2017.01.014.


More about the KIT Climate and Environment Center:


Being “The Research University in the Helmholtz Association”, KIT creates and imparts knowledge for the society and the environment. It is the objective to make significant contributions to the global challenges in the fields of energy, mobility, and information. For this, about 9,800 employees cooperate in a broad range of disciplines in natural sciences, engineering sciences, economics, and the humanities and social sciences. KIT prepares its 22,300 students for responsible tasks in society, industry, and science by offering research-based study programs. Innovation efforts at KIT build a bridge between important scientific findings and their application for the benefit of society, economic prosperity, and the preservation of our natural basis of life. KIT is one of the German universities of excellence.

le, 16.03.2017


Monika Landgraf
Head of Corporate Communications, Chief Press Officer
Phone: +49 721 608-41150
Fax: +49 721 608-43658
presse does-not-exist.kit edu

Contact for this press release:

Margarete Lehné
Press Officer
Phone: +49 721 608-41157
Fax: +49 721 608-41157
margarete lehne does-not-exist.kit edu
The photo in the best quality available to us may be requested by
presse does-not-exist.kit edu or phone: +49 721 608-41105.

The press release is available as a PDF file.