Of the roughly 6,000 different plants once consumed by human beings, only nine remain major staples today. Just three of these—rice, wheat, and corn—now provide 50 percent of all our calories. Widespread favorites like milk and beer are produced by conglomerates that are dangerously close to being monopolies, threatening long-term availability and the need for diversity. Looking for wisdom we have forgotten, BBC journalist Dan Saladino travels to Sierra Leone, Australia, and Georgia's Sea Islands, sharing an optimistic approach to food preparation and consumption that we can still adopt.