Do diets high in iron impair manganese status?

A recent study investigated the effect of dietary heme- and nonheme iron intake on iron and manganese status in young women. Despite representing only 5% of total dietary iron intake, heme iron was the primary determinant of iron status but had no influence on manganese status. In contrast, diets high in nonheme iron were not associated with better hematologic status, but serum manganese values were lower.