It is endemic among the poor in sub-Saharan Africa and Asia, where many people live in insanitary conditions and do not get enough calories, protein and micronutrients in their diet. Almost 25 per cent of children under the age of five was stunted and 10 per cent was wasted in 2016. Many women in poor households bear the burden of retrieving water from distant sources and often have little option but to use polluted wastewater for domestic purposes.