Transforming food systems to deliver healthy, sustainable diets—the view from the world's science academies

The most recent annual review by the Food and Agriculture Organization, the International Fund for Agricultural Development, The United Nations International Children's Emergency Fund, the World Food Programme, and WHO1 discloses a continuing rise in the absolute number of undernourished people worldwide. Other nutrition targets are also being missed and the review notes that climate extremes and variability are threatening to reduce and reverse previous gains made in food security. Poor diet is a factor in a fifth of deaths around the world.