A global walk against child hunger is due to take place in 90 countries around the world.
The WFP says feeding a child for a whole year costs just $34
The Walk the World event, organised by the UN World Food Programme, is raising funds for school meals in poor nations.
Every year, about 6.5 million children under the age of five die because hunger leaves their bodies too weak to resist disease.
Hunger and poverty are also among the main reasons why 100 million children are not in school.
The World Food Programme says the cost of school meals through its schemes works out at $34 (£18.7; 28 euros) per child per year - or 19 cents a day.
The Walk the World fundraiser will see volunteers join organised walks of about 5km (3.1 miles) in each of the 90 countries.
In Rwanda, the walk will start at a UN compound in the capital, Kigali. Among the walkers will be children already benefiting from the school feeding programme.
Cricketers Wasim Akram and Moin Khan will join walkers in Pakistan, while in Egypt, walkers will start and end their circuit at the Sphinx, passing by the pyramids en route.
The organisation is hoping to raise about $2m for its school feeding programme this year.