This week, we report from inside the HQ of the world's biggest food business, Nestlé to explore a wealth of solutions designed to solve the global nutrition crisis – including contact lenses that can monitor your glucose levels and smart watches that use your doctors' notes to prescribe exactly the right diet.

Around 795 million people go to bed hungry every night, while 2.1 billion people are overweight or obese; something's got to give. Hearing from businesses, NGOs, academics and consumer-bahaviour experts, this special edition of the show delves into the challenges of the food system – and why it is time to act now if we are to sustain 10 billion healthy people on this planet by 2050.