In response to the rising prevalence of obesity worldwide, there are increasing efforts to implement fiscal policies to promote healthy diets and prevent non-communicable disease (Teng et al., 2019; WHO, 2015; World Bank, 2020). An important trend is the taxation of sugar-sweetened beverages (SSBs), a category that includes sodas, colas, sports drinks, energy drinks, and sweetened juice drinks. Taxes on SSBs have been adopted by numerous countries worldwide, as well as in numerous U.S. cities. 1 Economists view these types of taxes as a way to internalize the external costs of obesity and diabetes (to which SSBs are seen to contribute) and address the internal costs of excessive consumption due to factors such as limited self-control and time-inconsistent preferences (see, e.g., Allcott et al., 2019;Teng et al., 2019; World Bank, 2020). 2 Most of the taxes on SSBs have been implemented in the past decade, and thus there is incomplete evidence about their effects.This paper studies the impact of a tax on SSBs that was imposed in the island country of Mauritius on January 1, 2013. Using data on adolescents from the Global School-Based Student Health Survey (GSHS), we estimate