Final answer:
The normal daily absorption rate of dietary iron is about 10%. This can be affected by factors such as iron status and diet composition, with vitamin C enhancing non-heme iron absorption.
Step-by-step explanation:
The percentage of dietary iron that is normally absorbed daily is about 10%. This absorption rate can vary depending on a variety of factors, such as the individual's iron status (with anemic individuals absorbing more), the type of iron consumed (heme iron found in animal products is more readily absorbed than non-heme iron found in plant sources), and accompanying nutrients (for example, vitamin C intake can enhance the absorption of non-heme iron).
On average, infants absorb about 10-15 mg of iron daily, while older children and adults require less. It is also important to note that while some groups, like pregnant women, may have higher iron needs (27 mg daily), the daily absorption rate does not significantly change, which is why meeting daily iron requirements through diet or supplements becomes critical for these individuals.
Good sources of iron include red meats like beef, shellfish such as clams and oysters, as well as non-animal sources like seeds, nuts, legumes, and fortified breakfast cereals. Eating these alongside foods rich in vitamin C can boost iron absorption.