CITIES are growing faster in sub-Saharan Africa than elsewhere, with an annual urban population growth rate of around 4% compared to the world average of 1.5%. Across the continent, the urban share of the total population is projected to increase to 50% by 2030 and 60% by 2050. Urbanisation is associated with lifestyle changes such as less physical activity and less labour-intensive work. This is often accompanied by an increased intake of high-calorie fast foods, snacks, and sugar-sweetened beverages. This combination has contributed to rising obesity in cities in low- and middle-income countries. At the same time, undernourishment and micronutrient…