Often referred to as the developing world's new burden of disease, obesity constitutes a major and growing health epidemic in Morocco, in particular for women (22% of women versus 8% of men). Through an analysis of qualitative data, I demonstrate how gender roles influence obesity risk in the Moroccan context. Current social and economic theories, including the nutrition transition theory, are inadequate in explaining the persistent gender differentials in health status across time and place. I suggest that Moroccan women's higher prevalence of obesity is predominantly the outcome of different risks acquired from their distinct roles. In the Moroccan context, we can gain insight into how men and women divide household labour and how the overall non-egalitarian nature of social roles may deleteriously affect women's health. I hypothesise that marital status, age and socioeconomic status determine Moroccan women's household roles and help to explain why women are more likely to be obese than men. The main findings support this hypothesis and demonstrate the interactive relationship between culture and structure in influencing obesity risk.