How we live is shaped by how we eat. You can see this in the vastly different approaches to growing, preparing and eating food around the world, such as the hunter-gatherer Hadza in Tanzania whose sustainable lifestyle is under threat in a crowded planet, or Western societies whose food is farmed or bred in vast intensive enterprises. And most of us now rely on a complex global food web of production, distribution, consumption and disposal, which is now contending with unprecedented challenges. The need for a better understanding of how we feed ourselves has never been more urgent. In this...