Everything around us has a rhythm, including the internal processes in our body. These are called circadian rhythms since they occur in a 24-h cycle (from Latin circa = around and dia = a day). During the COVID-19 pandemic, many people have seen their normal daily routine disrupted and they may have changed their timing of eating and sleeping. These changes in the timing of eating and sleeping may have had metabolic effects. Over the past decade, nutrition researchers have incorporated research of biological temporal rhythms, chrono-biology, into nutrition research, and this novel area of nutrition research is called chrono-nutrition. Chrono-nutrition includes research into the distribution of energy intake, meal frequency and regularity, the duration of eating and fasting periods, and the relative importance of these factors for metabolic health and chronic disease risk. This Virtual Issue brings together papers recently published in Nutrition Bulletin discussing different aspects of chrono-nutrition, including sleep, breakfast consumption and time-restricted feeding. Other elements of chrono-nutrition such as meal regularity, meal frequency and clock time (time of eating) are beyond the scope of this Virtual Issue. This editorial aims to set these papers in context of the wider research in this emerging field and goes on to discuss the potential public health implications of considering chrono-nutrition, including the importance of chrono-type and what findings from chrono-nutrition research might mean for shift workers.