Paul McCartney and Ed Sheeran are among the stars to help record a rap song for a campaign by celeb chef Jamie Oliver called the Food Revolution Day.

Oliver himself raps on the track, spitting, "Half the world is starving with too little to eat, and the other half died from being obese.

How people live the longest is they grow and they cook. Learn recipes from your parents and books."

The Revolution Day advocates for children who are undernourished, says Oliver.

"It's essential that we arm future generations with the life skills they urgently need in order to lead healthier, happier, more productive lives.

I passionately believe this is every child's human right and I hope you agree."