About one third of all food produced for human consumption goes to waste, according to a study commissioned by the United Nations food agency.
That amounts to more than one billion tonnes of waste around the world every year.
The study recommends that developing countries should improve production and distribution, so as to stop losing so much food.
It also says industrialised countries must stop throwing so much away.
Loss versus waste
The UN study, by the Swedish Institute for Food and Biotechnology, was aimed at an international trade fair for the food packaging industry, to be held in Germany later this month.
Among the key findings are that consumers in rich countries waste almost as much food, 222 million tonnes, as the entire net food production of sub-Saharan Africa.