One in three people in the world suffers from malnutrition of one form or another. The world's most prominent intergovernmental body for addressing this challenge, the UN Committee on World Food Security, has its own science advice service made up of experts from around the world.

In this episode, Professor Jennifer Clapp gives Toby Wardman a whirlwind tour of the High Level Panel of Experts on Food Security and Nutrition, the challenges of making policy in such a complex topic as global food systems, and what it's like to give high-profile science advice at a global level.

• Committee on World Food Security High-Level Panel of Experts: http://www.fao.org/cfs/cfs-hlpe