<qa>  What is the main public health problem in sub-Saharan Africa?Iron deficiency ID is still a main public health problem in sub-Saharan Africa. Iron deficient children have an increased risk for anemia which is associated with adverse infant development that might be partly irreversible. In sub-Saharan Africa, the etiology of ID in children is multifactoral; but the major causes are low iron dietary bioavailability and intake from monotonous cereal-based complementary foods. Children 5 years old can benefit from iron-fortified complementary foods; however, these fortified complementary foods are often not adapted to the requirements of children in specific setting. The investigators developed a complementary food fortificant CFF which is added to local porridge and is deemed to meet the nutrient intake requirement for iron in children 1-3 years of age. The CFF is lipid-based and can therefore, if regularly used, increase the daily energy intake of children which is often too low in developing countries with cereal-based diets. 