This article, through a series of provocations and anecdotes from my research into dietary health in early modern Japan (1600-1868), makes the case for transhistorical thinking as a productive analytical mode, allowing the past to speak to present concerns in creative and unexpected ways. As this volume seeks a fresh approach to Japanese Studies post-pandemic, addressing this tension between past and present, I argue, offers a productive way to turn the challenges of COVID-19 into opportunities for greater impact and interconnection. Now, however, is a bad time to question science. Vaccine hesitancy, resistance to mask mandates, and the overall politicization of commonsense health guidelines among a substantial plurality of the population indicate a sustained mistrust of health science expertise precisely when belief and compliance would do the most medical and social good. Doing the history of health in Japan through a transhistorical lens, I argue, exposes how a set of social divisions and challenges that may appear through a presentist lens to be as novel as the virus itself, and tied inextricably to the demands and paradoxes of modern state-based public health regimes, are in fact variants of issues that have been faced in dramatically different historical circumstances. This article follows these themes through three broad provocations that resonate between health’s past and present, drawn from the nineteenth-century history of diet and nutrition in Japan: skepticism of doctors and a critique of medical expertise; prioritising preventative versus retroactive care; and balancing health with opening the economy.