Which type of iron is absorbed readily in the duodenum and upper jejunum?

Heme iron is the type of iron that is absorbed readily in the duodenum and upper jejunum. This form of iron is derived from hemoglobin and myoglobin found in meat and fish. The structure of heme iron allows it to be absorbed more efficiently compared to other forms of dietary iron, such as ferric iron or free iron.

Once consumed, heme iron is taken up by specific transporters in the intestinal cells, making its absorption more efficient in the upper gastrointestinal tract. This is particularly important in populations at risk for iron deficiency, as heme iron can help improve overall iron status. The absorption mechanism for heme iron bypasses many of the regulatory processes that affect non-heme iron absorption, thus highlighting its effectiveness.

While other forms of iron can also be absorbed in the gastrointestinal tract, their efficiency can be influenced by various dietary factors, making heme iron a preferable source for enhancing iron levels in the body.