Popeye the Sailor Man & Spinach
Interference
The
absorption of nonheme iron is affected by many dietary factors. Oxalic acid in
vegetables and phytic acid as well as additional factors found in grain fibers
can bind iron and decrease its absorption. In tea, tannins (polyphenols) reduce
the absorption of nonheme iron. If someone has an iron deficiency, the intake
of tannins should be watched and fiber intake should be kept within current
recommendations. Additionally, zinc supplements will interfere with the
absorption of nonheme iron since zinc and iron compete for absorption.
Iron Needs &
Absorption
The body’s need for iron is the single most
important element affecting nonheme iron absorption. Iron needs increase:
•
During
growth and pregnancy;
•
During
a state of iron deficiency; and
• At high altitude due to the air’s lower oxygen concentration resulting
in the increased concentration of hemoglobin in the blood.
Where there are
inadequate iron stores, the main protein that transports iron in the blood
easily binds additional iron from intestinal cells, moving this iron into the
bloodstream. On the other hand, when there are adequate iron stores and the
protein that binds iron in the blood is totally saturated with iron, little is
absorbed from the intestinal cells where iron stays bound.
It is
through this mechanism that iron, and the nonheme form in particular, is only
absorbed as needed under normal circumstances. Intestinal cells have a two to
five day life cycle. If iron is not needed, it will be excreted from the iron
that is stored in intestinal cells. Even though high doses of iron is toxic,
under normal dietary conditions in the majority of people it is carefully
regulated.
Distribution
The
hemoglobin molecules of red blood cells contains the majority of iron in the
body. The bone marrow stores some, and a small amount is found in other body
cells, for example the liver, to store it. The iron found in these body stores
can be mobilized if iron is needed. However, these iron stores can be depleted
if there is a chronically inadequate intake of dietary iron.
In light of
the fact that iron deficiency remains a worldwide problem, its absorption is an
important factor. Even though a food may be rich in iron does not mean it will
be absorbed. The form of iron as well as interference with anti-nutrient
compounds and mineral interactions all affect absorption. Taking a specific
mineral supplement will interfere with the absorption of other essential
minerals. It is for this reason natural supplements are most effective. Studies
confirm that noni, a fruit rich in iron, selenium, zinc, and copper contains no
known anti-nutrient compounds in its leaves or fruit. It is also a rich source
of vitamin C which increases iron absorption. This makes Noni Fruit Leather,
developed by Hawaiian Organic Noni using a low-heat dehydration method, an
ideal source for iron.
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