BackgroundHangovers can impair the ability to drive a car or work in industrial settings, in addition to causing unpleasant symptoms such as headaches and fatigue. As for reducing hangover symptoms, the effect of consuming water between drinks, often referred to as a “chaser,” has been empirically recognized; however, this effect has not been verified to date. The purpose of this study was to clarify whether intermittent drinking of water during alcohol consumption affects the ethanol and acetal