Essential Minerals: The Vital Role of Iron and Iodine in Human Health

Minerals are essential for normal body functions and overall health. They are obtained through drinking water and consuming a balanced diet. Minerals play significant roles in virtually every metabolic process within the body, ensuring that various physiological systems operate efficiently.

Iron is a crucial mineral required for the production of hemoglobin in blood and myoglobin in muscles, which are essential for oxygen transport and storage. Additionally, several enzymes involved in metabolic processes contain iron. Iron deficiency leads to anemia, the most prevalent nutritional deficiency globally, affecting over 1.2 billion people. Symptoms of iron deficiency anemia include fatigue, weakness, and impaired cognitive function. To prevent anemia, individuals need approximately 10.0 mg of iron daily, which can be sourced from liver, muscle tissues, eggs, oatmeal, wheat flour, cocoa, and chocolate. Including vitamin C-rich foods, such as citrus juices, in meals can enhance the absorption of nonheme iron from plant-based sources, making breakfast an ideal opportunity to boost iron intake.

Iodine is another vital mineral necessary for the production of thyroid hormones, thyroxine (T4) and triiodothyronine (T3). These hormones, synthesized from iodide and the amino acid tyrosine, regulate metabolic rates and overall energy expenditure. Iodine deficiency can lead to hypothyroidism, characterized by low metabolic levels, lethargy, and goiter—a visible enlargement of the thyroid gland. This deficiency has been a concern for centuries, particularly in regions where soil and water lack sufficient iodine. The daily iodine requirement is about 0.1 mg, typically met through the consumption of iodide-rich foods like seafood and saltwater fish. In areas where natural iodine sources are scarce, iodized salt is a common preventive measure to ensure adequate intake.

In conclusion, minerals such as iron and iodine are indispensable for maintaining health and metabolic balance. Iron supports oxygen transport and enzymatic functions, while iodine is critical for thyroid hormone production and metabolic regulation. Ensuring adequate intake of these minerals through diet and supplementation when necessary is key to preventing deficiencies and associated health issues. By incorporating iron-rich and iodine-rich foods into daily meals, individuals can support their body's essential functions and overall well-being.
Essential Minerals: The Vital Role of Iron and Iodine in Human Health

Iron heme binding in human body

In humans eating an average normal diet, more than one third of the body’s total daily iron requirement of 3 mg comes from dietary heme-iron.

The duodenum and proximal jejunum are considered the main sites of absorption, not the stomach.

The most important group of iron binding proteins contains the heme molecules. Heme proteins contain one iron atom at the center of a porphyrin ring, which provides four equatorial nitrogen ligands to the metal. Heme functions as a prosthetic group for some proteins.

Heme proteins are generally responsible for oxygen binding (hemoglobin) and activation (cytochrome P450). Heme iron accounts for the majority of the iron in human body, and hemoglobin contains as much as 70% of the total iron content of a normal adult.

The atom of iron in the center of the heme molecules enables oxygen transport to tissues (hemoglobin); transitional storage of oxygen in tissues particularly muscle (myoglobin) and transport of electron through the respiratory chain (cytochrome).

Hemoglobin, a conjugated tetrametric protein, consists of four heme groups and globin, which is made up of four polypeptide chains. Each polypeptide chain is associated with one of the heme molecules.

These heme carrier proteins also carry out the redox reactions and electron transport required for oxidative phosphorylation, the process that is the principle source of energy for cells.

In addition to serving as a prosthetic group of hemoglobin, heme also regulates translation erythroid precursors. Iron in incorporated into protoporphyrin IX in the last step of heme biosynthesis by ferrochelatase to form heme.
Iron heme binding in human body

Interaction of Iron with Other Nutrients

Interactions among the trace minerals are common and often well-coordinated to meet the body’s needs.

A good source of one nutrient may be a poor food source of another and factors that enhance the action of some trace minerals may interfere with others.

Excessive iron supplementation is often a practice among humans and this excessive intake of non-heme iron may have detrimental effect on zinc nutrition.

It is believe that the basis of interaction between these two minerals is their competition for some portion of a common absorptive pathway.

As a general rule, excessive concentration of one divalent ion in the gastrointestinal tract may inhibit absorption of other divalent ions.

Conversely, a deficiency of one divalent ion may enhance the absorption of others. For example, iron deficiency makes the body more vulnerable to lead poisoning. There are clear indications that iron deficiency promotes cadmium retention and may this decrease the tolerance of high environmental or dietary cadmium levels.

At the metabolic level, an interrelationship appears to exist between iron and copper because the role of copper containing ceruplasmin as feroxidase.

Also ascorbic acid and iron are interrelated on that activation of several deoxygenases by ferrous iron appears dependent on the presence of ascorbate.

It is believed that stimulatory effect of ascorbic acid in iron absorption is exerted by both its reducing capacity, thereby keeping iron in more easily absorbed ferrous +II from and its chelating properties, keeping iron in a soluble, absorbable form.

Another example is inhibition of iron by phytic acid from whole grain, nuts, and legumes.
Interaction of Iron with Other Nutrients

Food as a Source of Minerals

Food as a Source of Minerals
It is known that human beings require 14 different elements for health and growth. These include calcium, phosphorus sodium, chlorine, potassium and magnesium and sulphur, which are present in appreciable amounts (0.5 percent or more ) the other iron, iodine, manganese copper, zinc, cobalt and fluorine are found in traces.

Functions of mineral
Minerals have several functions in the body. Body building minerals serve as structural constituents in the hard issues of the body, such as the bones and teeth.

They are the components of soft tissues (muscles, nervous tissue).

They form a part of compounds essential for body functions (hemoglobin, thyroxine, insulin etc.)

Body regulation
Some minerals help to maintain acid-bases balance and while others regulate water balance in the body. Some minerals are important in transmission of nerve impulses, while other are necessary for muscle connection and relaxation.

Essential for Active of Enzymes
Some metals are integral part of enzymes, while others function as cofactors of some enzymes.

Calcium and Phosphorus
The minerals are needed in comparatively large amounts to help normal growth and development of bones and teeth.

Breast milk supplies these in sufficient amounts for the six months of life. The best source of calcium is milk. Babies receive an excellent supply of calcium from their mother’s milk.

The milk of cows, buffaloes and goats is rich in calcium, so are milk products such as curd, paneer, khoa, cheese and milk powder. Other food sources are fish, sesame seeds, the miller ragi and dark green leafy vegetables.

Deficiency of calcium may lead to poor and teeth formation. Severe deficiency may cause rickets in children and osteomalacia in adults.

Iron
The iron requirement is met from the fetal store for the first three months. Iron is essential for the formation of hemoglobin, the red pigment in blood.

Iron is the one mineral, which is found in insufficient amounts in the infant’s diet when it is fed only milk.
Food as a Source of Minerals