Which statement correctly describes the bioavailability of heme versus non-heme iron?

Which statement correctly describes the bioavailability of heme versus non-heme iron?

• A. Heme iron (in animal foods) is absorbed more readily; non-heme iron (plants/fortified foods) is less readily absorbed, with absorption enhanced by vitamin C and acidic conditions.
• B. Non-heme iron is absorbed more readily than heme iron.
• C. Both are absorbed equally; vitamin C inhibits absorption.
• D. Heme iron is found only in plants.

Answer: (A)

The main idea is that iron comes in two forms with different absorption paths. Heme iron, from animal foods, is absorbed through a specialized, efficient pathway and is generally taken up more readily by the intestine. Non-heme iron, mainly from plant sources and fortified foods, must be converted from ferric (Fe3+) to ferrous (Fe2+) form before uptake, a process that is more variable and often less efficient. The absorption of non-heme iron is enhanced by vitamin C and acidic conditions, which help keep iron in the absorbable ferrous state and form soluble complexes. In contrast, non-heme iron absorption can be hindered by compounds like phytates and polyphenols in the meal. So, the statement describing heme iron as more readily absorbed and non-heme iron as less readily absorbed, with enhancement from vitamin C and acidic environments, accurately reflects their bioavailability.

The main idea is that iron comes in two forms with different absorption paths. Heme iron, from animal foods, is absorbed through a specialized, efficient pathway and is generally taken up more readily by the intestine. Non-heme iron, mainly from plant sources and fortified foods, must be converted from ferric (Fe3+) to ferrous (Fe2+) form before uptake, a process that is more variable and often less efficient. The absorption of non-heme iron is enhanced by vitamin C and acidic conditions, which help keep iron in the absorbable ferrous state and form soluble complexes. In contrast, non-heme iron absorption can be hindered by compounds like phytates and polyphenols in the meal. So, the statement describing heme iron as more readily absorbed and non-heme iron as less readily absorbed, with enhancement from vitamin C and acidic environments, accurately reflects their bioavailability.