"We could expand what we're able to digest -- maybe we're inhaling bacteria that help us digest foods that are not currently digestible," Twilley muses. "Rather than growing more food to feed more people, maybe what we say is, 'you know what? We can actually chew on a twig instead.'" At the Aspen Ideas Festival, the author of the blog EdibleGeography.com describes how technologies like refrigeration and "probiotic cities" might shape the future of what we eat. This video is part of a series on the Atlantic Video channel, The Future of X, looking at what's on the horizon for culture, technology, business, and politics.