Whether you’re a meat eater, vegan, or vegetarian, the role of protein in our diet is something we all need to think about. In the food industry it’s widely accepted that ‘alternative proteins’ will play an important role in creating a more sustainable food system – but what exactly are they, and should we all be eating them? To answer these questions Matt and Lukxmi meet Roberta Iley from Forum for the Future's Protein Challenge 2040, and Jim Laird, CEO of 3F Bio, a startup developing alternative proteins through fermentation.