Malaria infections are endemic in northern Benin. To investigate the contribution of asymptomatic malaria (a positive blood smear for malarial parasites but without clinical symptoms of fever, headache or malaise) to anemia, we are planning a human iron absorption study in Benin. We will recruit adults with asymptomatic malaria infection. The iron absorption and utilization of the study subjects will be studied while infected, then they will be treated to clear their infections, and then iron absorption and utilization will be restudied. Iron absorption will be determined by incorporation of labeled iron into erythrocytes, 14 days after the administration of a test meal containing labeled iron (stable isotope technique). Subjects will be men and non-pregnant, non-breastfeeding women with a body weight < 65 kg and between the age of 18 - 30 years.