The research, conducted to support global efforts to halve food waste by 2030, indicates that the weight roughly equals that of 23 million fully-loaded 40-tonne trucks -- enough bumper-to-bumper to circle the Earth 7 times.
"Reducing food waste would cut greenhouse gas emissions, slow the destruction of nature through land conversion and pollution, enhance the availability of food and thus reduce hunger and save money at a time of global recession," Inger Andersen, Executive Director of the United Nations Environment Programme (UNEP), said in a statement.
"If we want to get serious about tackling climate change, nature and biodiversity loss, and pollution and waste, businesses, governments and citizens around the world have to do their part to reduce food waste," Anderson added.
For the study, the team looked at food waste that occurs in retail outlets, restaurants and homes -- counting both food and inedible parts like bones and shells.
The report presents the most comprehensive food waste data collection, analysis and modelling to date, and offers a methodology for countries to measure food waste. 152 food waste data points were identified in 54 countries.
The report finds that in nearly every country that has measured food waste, it was substantial, regardless of income level.
It shows that most of this waste comes from households, which discard 11 per cent of the total food available at the consumption stage of the supply chain. Food services and retail outlets waste 5 per cent and 2 per cent, respectively.
On a global per capita-level, 121 kilograms of consumer-level food is wasted each year, with 74 kilograms of this happening in households.
With 690 million people affected by hunger in 2019, a number expected to rise sharply with Covid-19, and three billion people unable to afford a healthy diet, consumers need help to reduce food waste at home, the researchers said.