The 1987-1990 Hyderabad Nutrition Trial enrolled pregnant women and young children from 29 villages in administrative areas near the city of Hyderabad in the state of Andhra Pradesh (now in Telangana). First, two adjacent sub-districts (group of villages, called a block) were selected for the study - one for the intervention group and the other as control. Then, 15 intervention and 14 control villages were selected. Intervention and control group villages had similar levels of access to other public health programs such as immunization and anemia control in pregnancy.