Prime Minister David Cameron will today host a summit aimed at tackling world hunger in the years before the next Olympic Games in Brazil.
International politicians and sporting greats are expected to get together for the event, which is designed to shine the spotlight of the Games on the issue of child malnutrition.
Britain's double Olympic gold medal winner Mo Farah, whose own charity helps raise money for victims of drought in the Horn of Africa, has also been invited to attend.
Mr Cameron is hoping to secure sufficient commitments from leaders and multinational firms to help prevent 25 million children under five suffering stunted growth by the time of the 2016 Olympic Games in Rio de Janeiro.
Save the Children says, on present trends, there will be more than three million more stunted children across Africa by the time of the Rio Games.
Britain will pledge a £120m investment in drought-resistant crop research, help for schemes such as a text message hunger alert system in Kenya and pressure on global companies to play their part.
Mr Cameron will tell the summit: "While people around the planet have been enjoying and competing in these Games there's another world where children don't have enough to eat, and never get the start in life they deserve.
"It is a tragedy for them, and it's a tragedy for their societies they live in. Children who could grow up to become doctors, farmers, engineers and entrepreneurs or great Olympians are left far behind.
"We've a responsibly to tackle this. But the hard truth is that while we've made huge strides in the last decade on things like education, malnutrition rates have stagnated.
"I'm determined that Britain helps change this."
Farah, who was born in Somalia, said he set-up his charity to inspire young Africans.
"I am very lucky, I came to Britain just as a kid, but there's kids out there who would love to have a chance and I know they are good at running," he said.
"But for me, when I went not long ago to Somalia and then I saw the kids, the poverty was very bad. I set up the Mo Farah Foundation which is a charity which supports them.
"We deliver food, water, water wells, so I am trying to give back as much as I can because I know there're a lot of kids out there who would love to have a chance."
The "hunger summit" will bring together leaders and senior politicians from Brazil, Kenya, Bangladesh, India and Ireland as well as sporting greats such as Ethiopian distance runner Haile Gebrselassie and football star Pele.