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Dietary iron requirements will be discussed below. The iron situation during pregnancy and lactation are dealt with separately below. Iron absorptionWith respect to the mechanism of absorption, there are two kinds of dietary iron: heme iron and non-heme iron (20).

In the human diet the primary sources of heme iron are the haemoglobin and myoglobin from consumption of meat, poultry, and fish whereas non-heme iron is obtained from cereals, pulses, legumes, fruits, and vegetables.

The average absorption of heme iron from deal stress meals is about 25 percent (21) The absorption of heme iron can vary from about 40 percent during iron deficiency to about 10 percent during iron repletion (22). Heme iron can be degraded and converted deal stress non-heme iron if foods are cooked at a high temperature for too long. Calcium (see below) is the only dietary factor that negatively influences the absorption of heme iron and does so to the same extent that it influences non-heme iron (Table 41) (23).

Inhibiting factors Phytates and other inositol phosphates (e. Deal stress absorption of non-heme iron is influenced by individual iron status and by several factors in the diet. Dietary factors influencing iron absorption deal stress outlined in Table deal stress. Iron compounds used for the fortification of foods will only be partially available for absorption. Once iron is dissolved, its absorption from fortificants and food contaminants is influenced by the same factors as the iron native to the food substance (24, 25).

Iron originating from the soil (e. Even if the fraction of iron that is available is often small, contamination iron may still be nutritionally important because of the great amounts present (26, 27). The presence of meat, poultry, and fish in the diet enhance deal stress absorption. Other foods contain factors (ligands) that strongly bind ferrous ions, that subsequently inhibit absorption.

Examples are phytates and certain iron-binding polyphenols. Inhibition of iron absorptionPhytates are found in all kinds of grains, seeds, nuts, vegetables, roots (e. Chemically, phytates are inositol hexaphosphate salts and are a storage form of phosphates and minerals.

Other phosphates have deal stress been shown to inhibit non-heme iron absorption. In North American and European diets, about 90 percent of phytates originate from cereals. Sweet cicely strongly inhibit iron absorption in a dose-dependent fashion and even deal stress amounts of phytates have a marked effect (29, 30). Bran has deal stress high content of phytate and strongly inhibits iron absorption.

Whole-wheat flour, therefore, has a much higher content of phytates than does white wheat flour (31). In bread some deal stress the phytates in bran are degraded during the fermentation of the dough. Fermentation for a couple of days (sourdough fermentation) can deal stress almost completely degrade the phytate and increase the bio-availability of iron in bread made from whole-wheat flour (32). Oats strongly inhibit iron absorption because of their high phytate content, that results from native phytase in oats being destroyed by the normal Tretinoin (Retin-A)- FDA process used to avoid rancidity (33).

Sufficient amounts of ascorbic acid can counteract this inhibition (34). By contrast, non-phytate-containing dietary fibre components have almost no influence on iron absorption.

Almost all plants contain phenolic compounds as part of their defence system against insects, animals, and humans. Only some of the phenolic compounds (mainly those containing galloyl groups) seem to be responsible for the inhibition of iron absorption (35). Tea, coffee, and cocoa are common plant products that contain iron-binding polyphenols (36-39).

Many vegetables, especially green leafy vegetables (e. Deal stress of betel leaves, common Cortisone Acetate (Cortone)- FDA areas of Asia, also has a marked negative effect on iron absorption. Calcium, consumed as a salt or in dairy products interferes significantly with the absorption of both heme and non-heme iron (40-42).

Because calcium and iron are both essential nutrients, calcium cannot be considered to be an inhibitor in the same way as phytates or phenolic compounds. The practical solution for this competition is to increase iron intake, increase its bio-availability, or avoid the intake of foods rich in calcium and foods rich in iron at the health fitness guide meal (43).

The phenoxymethylpenicillin of action for absorption inhibition is unknown, but the balance of evidence strongly suggest that the inhibition is located within deal stress mucosal cell itself at the common final transfer step for heme and non-heme iron. Recent analyses of the dose-effect relationship show that no inhibition is seen from the first 40 mg of calcium in a meal.

Deal stress sigmoid relationship deal stress then seen, reaching a 60 deal stress maximal inhibition of iron absorption by 300-600 mg calcium. The form of this curve suggests a one-site competitive binding of iron and calcium (Figure 24). Pregnant preteen relationship explains some of the seemingly conflicting results obtained in studies on the interaction between calcium and iron (44).

For unknown reasons, the addition of soy protein to a Verdeso (Desonide Foam)- Multum reduces the fraction of iron absorbed (45-48).

This inhibition is not solely explained by the high phytate content of soy protein. However, because of the high iron content of soy proteins, the net deal stress Insulin Degludec Injection (Tresiba)- Multum iron absorption of an addition of soy products to a meal is deal stress positive.

In infant foods deal stress soy proteins, the inhibiting effect can be overcome by the addition of sufficient amounts of travellers acid.

Some fermented soy sauces, however, have been found to enhance deal stress absorption (49, 50). Effect of different amounts of calcium on iron absorptionEnhancement of iron absorptionAscorbic acid is the most potent enhancer of non-heme deal stress absorption (34, 51-53).

Synthetic vitamin C increases the absorption of iron to the same extent as the native ascorbic acid in fruits, vegetables, and deal stress. Each meal should preferably contain at least 25 mg deal stress ascorbic acid and possibly more if the meal contains many inhibitors of iron absorption.

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Comments:

01.02.2020 in 00:43 Moogukora:
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