Essential Minerals: Key Roles, Sources, and Health Benefits

Minerals are essential for normal body functions, playing a vital role in growth and maintenance. Key minerals include water, common salt, calcium, magnesium, iron, sodium, potassium, chlorine (from salt), sulfur, phosphorus, and silicon. Unlike other nutrients, minerals consist of single atoms and carry a charge in solution. This property allows them to combine with other minerals to form stable complexes in bones, teeth, cartilage, and other tissues.

Iron is a crucial mineral, forming part of the blood pigment hemoglobin and the muscle pigment myoglobin. It is also a component of several body enzymes. Iron absorption occurs when iron enters the intestinal mucosa cell through the brush border membrane. A deficiency in iron leads to anemia, characterized by fatigue, weakness, and pallor. To prevent such deficiencies, it is essential to consume iron-rich foods like liver, animal muscle tissues, eggs, oatmeal, wheat flour, cocoa, and chocolate. The recommended daily intake of iron is approximately 10.0 mg.

Recent studies have highlighted the importance of maintaining adequate mineral levels for overall health. For example, magnesium is involved in over 300 biochemical reactions in the body, including energy production and muscle function. Potassium is vital for proper heart and muscle function, while calcium is essential for bone health and muscle contraction.

In addition to the sources mentioned, many foods are rich in essential minerals. Dairy products like milk, cheese, and yogurt are excellent sources of calcium. Green leafy vegetables such as spinach and kale provide magnesium, potassium, and calcium. Nuts and seeds, including almonds, sunflower seeds, and chia seeds, are packed with magnesium and phosphorus. Whole grains like brown rice and quinoa are good sources of magnesium, iron, and zinc.

In the modern diet, there is an increased emphasis on bioavailability—the degree to which a nutrient is absorbed and utilized by the body. Factors such as the presence of other nutrients, the form of the mineral, and the individual's health status can affect bioavailability. For iron, consuming it with vitamin C-rich foods can enhance its absorption, while phytates in certain grains can inhibit it.

In conclusion, minerals are indispensable for various bodily functions and overall health. A balanced diet rich in diverse foods ensures adequate mineral intake, supporting growth, energy production, and the prevention of deficiencies. Incorporating a variety of mineral-rich foods such as dairy products, green leafy vegetables, nuts, seeds, and whole grains can help maintain optimal health and well-being.
Essential Minerals: Key Roles, Sources, and Health Benefits

Vitamin C: Enhancing Iron Absorption and Preventing Deficiency

Ascorbic acid, or vitamin C, is a chemically defined compound with the empirical formula C6H8O6 and a molecular weight of 176.13. This vital nutrient plays several essential roles in the human body, including the biosynthesis of collagen, L-carnitine, and certain neurotransmitters, and it is also involved in protein metabolism.

One of the significant functions of vitamin C is its ability to enhance the bioavailability of dietary iron. Iron, a crucial mineral for numerous physiological processes, is absorbed in the intestines from two different sources: heme and nonheme iron. Heme iron, found in animal products such as red meat, chicken, and fish, is absorbed more efficiently than nonheme iron, which is abundant in plant-based foods like whole grains, beans, fruits, and vegetables. The dominant form of iron in these foods is ferric iron (Fe3+), which is less bioavailable compared to ferrous iron (Fe2+).

Vitamin C dramatically improves the absorption of nonheme iron by reducing ferric iron to ferrous iron. This reduction is crucial because Fe2+ is the only form of iron that can be absorbed by the intestinal enterocyte cells via specific iron transporters. Ascorbic acid achieves this by creating a chelate with ferric iron at the acidic pH of the stomach, maintaining its solubility in the alkaline environment of the duodenum, the first section of the small intestine. Furthermore, ascorbic acid, in its salt form ascorbate, acts as a free radical scavenger and donates an electron to reduce iron oxidation states to Fe2+.

Interestingly, recent research has identified the role of ferrireductase Dcytb (duodenal cytochrome b), located at the brush border membrane of duodenal enterocytes, in reducing Fe3+ to Fe2+. This discovery suggests that ascorbic acid's primary function may be to promote iron solubility rather than directly reducing iron itself. However, the presence of ascorbic acid still significantly enhances iron absorption due to its chelating and solubility-promoting properties.

Practical dietary sources of vitamin C include citrus fruits, fresh bell peppers, strawberries, cantaloupe, and fresh broccoli. For instance, just four ounces (half a cup) of orange juice is sufficient to increase iron absorption. This is particularly important in preventing iron deficiency anemia, the most common nutritional deficiency worldwide.

Iron deficiency anemia occurs when there is inadequate iron absorption, leading to a reduced number of red blood cells or hemoglobin, and subsequently, insufficient oxygen transport in the body. Symptoms can range from fatigue and weakness to more severe complications if left untreated. Enhancing dietary iron absorption through vitamin C intake is a practical and effective strategy to combat this prevalent nutritional issue.

Overall, the interplay between ascorbic acid and iron absorption highlights the importance of a balanced diet rich in both vitamin C and iron. By understanding and utilizing the biochemical mechanisms at play, individuals can better manage their nutritional intake to prevent deficiencies and promote overall health.
Vitamin C: Enhancing Iron Absorption and Preventing Deficiency

Hereditary Hemochromatosis Overview

Hereditary hemochromatosis (HH) denotes a group of uncommon genetic disorders characterized by the buildup of iron in various organs, including the skin, heart, liver, pancreas, pituitary gland, and joints.

Because the body lacks the capability to enhance iron excretion, an excess of iron can accumulate, resulting in abnormal storage that gradually becomes toxic, causing harm to tissues and organs.

Symptoms of hemochromatosis include fatigue, weight loss, joint discomfort, a bronze or grey skin tone, abdominal pain, and a reduced sex drive. Typically, these symptoms surface in adulthood, often after a significant surplus of iron has amassed in the body. Most individuals do not experience symptoms until later in life, typically after the age of 40 in men and 60 in women.

As the condition advances, affected individuals may develop arthritis, liver complications such as cirrhosis or cancer, diabetes, heart irregularities, and skin discoloration. The root cause of hemochromatosis lies in a faulty gene, commonly the HFE gene, which can be inherited from parents and affects the body's ability to absorb iron from food.
Hereditary Hemochromatosis Overview

Transfusional hemochromatosis

Hemochromatosis is a condition caused by extraordinary iron deposition in parenchymal cells leading to cellular damage and organ dysfunction. It is also called iron overload.

The disorder has two classifications:
*Genetic (or primary) hemochromatosis and
*Secondary (or acquired) hemochromatosis.

In secondary hemochromatosis, it may occur as a result of other blood disorders, such as thalassemia or certain anemias. Too many blood transfusions over time may lead to iron overload.

Transfusional hemosiderosis is the accumulation of iron in the liver and heart but also endocrine organs, in patients who receive or did receive frequent blood transfusions (such as those with thalassemia, sickle cell disease, leukemia, aplastic anemia or myelodysplastic syndrome).

𝛽-thalassemia major is one of the causes of secondary hemochromatosis with adoption of an intensive transfusional regimen to maintain adequate levels of hemoglobin.

Cirrhosis and diabetes are known clinical manifestations in patients with transfusional hemochromatosis. A unit of transfused blood contains approximately 250 mg of iron. The excess iron from the transfused erythrocytes gradually accumulates in various tissues, in the skin, heart, gonads, and endocrine glands causing morbidity and mortality.
Transfusional hemochromatosis

Hereditary hemochromatosis

Hereditary hemochromatosis or also called an iron overload disorder is an autosomal recessive disorder that causes the body to absorb too much iron from the diet.

These rare genetic disorders are characterized by the accumulation of iron in the body's tissues and organs such as the liver, heart and pancreas.

Because humans cannot increase the excretion of iron, excess iron can overload and eventually can lead to life-threatening conditions, such as liver disease, heart problems and diabetes.

The genes that cause hemochromatosis are inherited, but only a minority of people who have the genes ever develop serious problems.

The symptoms of classic hereditary hemochromatosis develop gradually over many years and may include weakness, lethargy, arthralgias, and impotence. Later manifestations include arthralgias, osteoporosis, cirrhosis, hepatocellular cancer, cardiomyopathy, dysrhythmia, diabetes mellitus, and hypogonadism.

Symptoms usually become apparent at some point between 40-60 years of age, but may develop early or later. Symptoms rarely develop before 20 years of age.
Hereditary hemochromatosis

Problems with high iron intake

Excessive iron intake can also cause problems. In healthy people, taking high doses of iron supplements (especially on an empty stomach) can cause an upset stomach, constipation, nausea, abdominal pain, vomiting, and fainting.

Too much iron in the tissues and organs leads to the production of free radicals and increases the need for vitamin E.

Acute high doses of iron can damage the intestinal mucosa and cause systemic shock and death. Continuous exposure to lower amounts may interfere with the metabolism of copper and zinc

Extremely high doses of iron (in the hundreds or thousands of mg) can cause organ failure, coma, convulsions, and death. High levels of iron have also been found in association with heart disease and cancer.

The buildup or iron in the tissues has been associated with a rare disease known as hemochromatosis, a hereditary disorder of iron metabolism that is found mostly in men and that causes excessive absorption of iron from both foods and supplements, leading to bronze skin pigmentation, arthritis, cirrhosis of the over, diabetes and heart disorders. People with this disorder should avoid using iron supplements and vitamin C supplements.
Problems with high iron intake

Fortification of foods with iron

Iron has many different roles in the body. Iron is essential for almost every organism due to its involvement in a wide variety of metabolic processes.

Iron deficiency is the most common nutritional deficiency disorder in the world, affecting more than two billion people, mostly infants, children and women of childbearing age. About 40% of the world’s population (i.e. more than 2 billion individuals) is thought to suffer from anemia, i.e. low blood hemoglobin.

In general, iron deficiency symptoms are attributed due to an insufficient supply of iron to the tissues, and probably not to lowered hemoglobin level.

Consuming foods with vitamin C, such as citrus, tomatoes, or red peppers with meals can help increase iron absorption. Whole-grain, enriched, and iron-fortified bread and cereal products are also good sources of iron.

Fortification of food with iron, when an appropriate diet is not available, is considered the best sustainable way of preventing iron deficiency. It is the most sustainable, convenient, and cost-effective tool for its management.

A number of foods have been effectively fortified with iron, including salt, sugar, curry powder, and fish sauce. Milk, dried milk, and various milk-derived foods have been fortified with iron in South America. Iron-fortified baby food is a great tool to effectively control iron deficiency anemia.

Foods for young children were fortified with iron, a practice which has substantially reduced the risk of iron-deficiency anemia in this age group.

Cereal flours (wheat and maize) are currently the most common vehicles for iron fortification to reach the general population.
Fortification of foods with iron

Iron dependent enzymes

Iron is an essential cofactor for enzymes involved in numerous cellular processes. Iron is one of most commonly minerals encountered in enzymes catalyzing oxidoreduction reactions. In the majority of cases, the metal ion participates directly in the electron transfer process and undergoes a cyclic change in oxidation state.

Iron is required as a cofactor for many hemoproteins and non-haem iron-containing proteins which involved in most of the major metabolic processes in the cell. Hemoproteins include hemoglobin and myoglobin that are responsible for oxygen binding and transport, catalase and peroxidase enzymes, which take part in oxygen metabolism, and cytochromes, which are involved in electron transport and mitochondrial respiration.

Structurally, enzymes are built up from proteins and contain an active site, where substrate and oxidant are brought together to initiate a chemical reaction.

Iron deficiency led to changes in glucose metabolism, amino acid biosynthesis, and lipid biosynthesis that were due to deficiencies in specific iron dependent enzymes. Iron-sulfur proteins exhibited loss of iron cofactors, yet amino acid synthesis was maintained.
Iron dependent enzymes

Major minerals important to human health

The main minerals that keep human health intact and prevent from getting ill with a wide range of diseases are: Calcium, Magnesium, Potassium and Iron. They all strengthen the natural defense shield of immune system. Moreover, they have tones of other benefits on the main organs and functions of human body.

Calcium is the most abundant mineral in the body. Around 99 percent of calcium is stored in bones and teeth, where it supports their structure and function. The remaining one percent is used to support metabolic functions. Calcium is important for helping muscles relax and contract; important in nerve functioning, blood clotting, blood pressure regulation, immune system health.

Magnesium is the sixth most abundant mineral in the body Magnesium helps manage muscle and nerve function, control blood glucose levels, regulate blood pressure, and make DNA, protein and bones. It works with calcium to assist in muscle contraction, blood clotting, and the regulation of blood pressure and lung function.

Potassium is the third most abundant mineral in the body and is an electrolyte that helps with proper nerve and muscle functions including the beating of the heart.

Iron helps make many proteins, including hemoglobin, a protein that carries oxygen to body tissues, and myoglobin, which brings oxygen to the muscles. Human body also uses iron for growth and development, and to make some connective tissue and hormones. Part of a molecule (hemoglobin) found in red blood cells that carries oxygen in the body and it needed for energy metabolism.

Major minerals important to human health

Vegetarians need more iron compared with non-vegetarians

Iron is a mineral that is naturally present in many foods, added to certain food products, and available as a dietary supplement. It is an essential mineral needed to help red blood cells supply oxygen to our muscles for energy.

Vegetarians need almost twice the daily recommended amount of iron compared with non-vegetarians. Iron from plant-based foods is not absorbed as well by human bodies as animal food sources.

Plant-based sources of iron include pulses and legumes (such as beans, peas, and lentils), dark green leafy vegetables (such as spinach, cabbage, and broccoli), tofu, nuts and seeds.

Much of the iron in meat is heme iron, which is more easily absorbed from food and used by your body. Plant foods contain only non-heme iron. Although some plant foods are good sources of iron, it is often attached to compounds that reduce its absorption. These compounds are called phytates and are found in whole grains and dried beans.

Vitamin C enhances iron absorption from such plant sources, so eating vitamin C- containing foods (grapefruit, oranges, tomatoes, broccoli, and strawberries) in combination with iron-rich vegetables, fruits, nuts, etc. is recommended.
Vegetarians need more iron compared with non-vegetarians

Iron Is Required For A Healthy Immune System

Iron is essential for almost all living organisms and takes part in a number of important biological processes.

The ability of this mineral switch between multiple oxidation states makes it an important co-factor in electron transfer and oxidation-reduction reactions. This characteristic also allows iron to interact reversibly with other atoms, especially oxygen, sulphur and nitrogen. Iron plays a number of important roles in the immune system and it stores are carefully controlled by the body.

Having too little iron can cause the degradation non-specific immunity, which is the body's first line of defense against pathogens. A healthy iron intake helps body immune system to work properly.

Iron binding proteins like lactoferrin are involved in the immune response. While iron-containing enzymes are released from cells of the immune system and exhibit destructive activity against foreign antigens.

Lactoferrin is a nutrient classically found in mammalian milk and lactoferrin has important immunological characteristics: antibacterial and also antiviral. Furthermore, there is evidence that it can bind to at least some of the receptors used by coronaviruses and thereby block their entry.

Iron deficiency has been reported to be associated with increased susceptibility to infection in both humans and experimental animals.

Iron Is Required For A Healthy Immune System

Iron deficiency anemia: Definition and aetiology

Anemia is a blood disorder. In anemia, human body doesn’t have enough red blood cells. Anemia resulting from iron-restricted erythropoiesis occurs through several mechanisms.

Iron deficiency is defined as a condition in which there are no mobilizable iron stores and in which signs of a compromised supply of iron to tissues, including the erythron. In pure iron deficiency, depleted iron stores are due to an imbalance between iron uptake and utilization. Chronic iron deficiency subsequently results in iron deficiency anemia.

The World Health Organization defines anemia as a level of Hb below 13.0 g/dL in male adults, below 12.0 g/dL in female adults who are not pregnant, and below 11.0 g/dL in pregnant women.

Iron-deficiency anemia may develop because the body’s demand for iron is greater than its supply, because of low iron intake or poor iron absorption, or as a result of blood loss.

Blood loss such as that associated with schistosomiasis, hookworm infestation, hemorrhage in childbirth, and trauma, can also result in both iron deficiency and anemia. Lastly, as with vitamin A deficiency, inhibition of the normal metabolism of iron can result in anemia.

Low iron intake or poor absorption of iron may occur as a result of:
*An inadequate diet
*An inability to absorb iron from diet
*Acute or chronic inflammation (such as inflammatory bowel disease)
Iron deficiency anemia: Definition and aetiology

Blood and functions of iron

About 6 percent of body iron is a component of certain proteins, essential for respiration and energy metabolism, and as a component of enzymes involved in the synthesis of collagen and some neurotransmitters.

Perhaps the most important of iron’s functions in the body is the production of hemoglobin and myoglobin (the form of hemoglobin found in muscle tissue), and the oxygenation of red blood cells. Myoglobin takes oxygen from hemoglobin and delivers it to muscle cells, and the cytochromes, which are important for generating energy.

Iron complexed with the protein hemoglobin is necessary for oxygen transport in the blood. Iron is the central atom of the heme group, a metal complex that binds molecular oxygen (O2) in the lungs and carries it to all of the other cells in the body that need oxygen to perform their activities.

Iron is the mineral found in the largest amounts in the blood. About 25 percent of the iron in the body is stored within enterocyte in the form of ferritin, circulates in the blood. Ferritin is made up of heavy and light chain subunits, which create a spherical hollow space that can accommodate up to 4500 iron ions.

The average adult male has about 1,000 mg of stored iron (enough for about three years), whereas women on average have only about 300 mg (enough for about six months).

Ferritin can release iron if the blood has a low iron concentration, and it can help to store excess iron if the blood and tissues have a high iron concentration. Hence, ferritin functions as a "buffer" against iron deficiency and, to a lesser extent, against iron overload.

When iron stores are exhausted, the condition is called iron depletion. Further decreases may be called iron-deficient erythropoiesis and still further decreases produce iron deficiency anemia.
Blood and functions of iron

Iron absorption in the small intestine

Iron plays an important role in a wide variety of metabolic processes and is an essential nutrient for almost all living organisms.

Iron absorption occurs mainly in the duodenum and upper jejunum, though small amounts may also be absorbed from the stomach, ileum and colon.

Iron enters the stomach where it is exposed to stomach acid and changed into a form that allows it to be absorbed. The portion of the small intestine called the duodenum is the chief area where iron absorption takes place. There may be a second minor absorption site near the end of the small intestinal tract.

Iron is provided to the body in various forms through the diet, but is primarily absorbed as either inorganic iron or as heme iron.

Iron released from food in the stomach appears to be absorbed by the apical villi of duodenal epithelial cells. Intestinal epithelial cells are unique cells with functional and morphological polarity. Ferrous iron passes through the apical membrane (at the luminal surface) and basolateral membrane (at the serosal surface) into the portal vein.

Iron transported into the mucosal cells through the apical membrane, but which is not transported to the portal blood, is stored by intracellular ferritin. Ferritin expression in the small intestinal mucosa is controlled by iron nutritional status, and is lost after 1 – 2 days when the epithelial cells are sloughed at the villus tip.

The second stage of iron absorption is termed basolateral or serosal transfer, where iron is transported from the enterocytes into the intestinal capillaries across the basolateral membrane via the iron transporter ferroportin 1.
Iron absorption in the small intestine

Lipid oxidation can cause deterioration in food quality

Lipids play a vital role in the metabolism of cells by providing a source of energy and reserve storage materials. There are many catalytic systems that can oxidize lipids. Among these are light, temperature, enzymes, metals, metalloproteins and microorganisms.

Cations in foods, such as Fe2+ and Cu2+, may induce a diversity of undesirable effects that influence the nutritional quality of foods. Iron actively catalyses lipid oxidation and its presence even in trace amounts has long been recognized as potentially detrimental to the shelf-life of fats, oils, and fatty acids.

Lipid oxidation is one of the major causes of quality deterioration in natural and processed foods. Oxidative deterioration is a large economic concern in the food industry because it affects many quality parameters such as flavour (rancidity), colour, texture, and the nutritive value of foods. Oxidation can occur in both triglycerides and phospholipids of food because lipids are divided into two main classes; polar lipids (phospholipids) and neutral lipids (triglycerides).

Oxidation affects many interactions among food constituents, leading to both desirable and undesirable products. Food lipids are the foods components that are most susceptible to oxidation, therefore oxidation reactions are one of the major sources of deterioration that occurs during manufacturing, storage, distribution and final preparation of foods.
Lipid oxidation can cause deterioration in food quality

Iron losses in human body

Determination of RDA for iron has been based upon the fact that in the United States, iron intake is frequently inadequate in four population groups.

• Infants and young children (6 months to 4 years) because of low iron content of milk and other preferred food, rapid growth rate, and body reserves of iron insufficient to meet needs beyond 6 months.
• Adolescents in their early growth spurt because of rapid growth and needs of expanding red cell mass.
• Females during child bearing years because of menstrual iron losses
• Pregnant women because of their expanding blood volume, demands of fetus and placenta, plus blood losses to be incurred in childbirth.

Basal iron losses that average about 0.7 to 1.0 mg/d are exhibit by the adult male and the post-menopausal.

Assuming an average iron absorption of 10-15% an intake of 10 mg iron daily appears generous for these population groups.

Basal losses of iron plus increased needs have been considered in formulating the RDA for those groups frequently at risk.
Iron losses in human body

Iron fortification of foods

Fortification means the addition to food of nutrients in such amounts that their final levels in the food are greater than those that were naturally present.

Some of common foods which are present fortified with iron are commercial infant formulas, infant cereals and breakfast cereals. There are three types of fortification strategies: mass fortification, open market fortification and targeted fortification.

Food fortification is a major source of iron for millions of anemic infants, children and women worldwide. Iron has a complex chemistry as well as metabolism and reactions are dependent upon pH, potential oxidation, competition for other minerals, and presence of food components that can block or enhance its absorption. 

Cereals are the most widely used vehicles for iron fortification although many others, such as milks products, sugar, curry powder, soya sauce and cookies have been successfully used.

The variety of beverages consumed throughout the world could be used as an effective and convenient form of iron fortification in the human diet.

Iron is well absorbed from most beverages and consumption of iron-fortified beverages between meals can increase iron absorption three to fourfold over absorption from a vegetal meal.
Iron fortification of foods

Iron in meat

There are two different types of digestible iron in food
*Hemo or (heme) iron found in red meat, seafood and poultry
*Non-hemo (or non heme) iron found in breads, fruits, breakfast cereals, vegetables, legumes, nuts and eggs.

Iron has important biochemical functions in animal since it is a component of hemoglobin, myoglobin, cytochrome and the enzymes catylase and peroxidase.

The iron in these materials exists in porphyrin rings. The best meat sources are liver, red meats, poultry, fish, oysters and clams.

Hemo iron foods are rich in iron and contain iron in a form that is easily absorbed by the body. Red meat also has a special effect on iron absorption. Red meat, when eaten together with the vegetables, can boost the absorption of non-hemo iron by up to 400%. The human body can absorb more than three times as much iron from a 90 gram serving of sirloin steak than a cup of cooked spinach.

In cattle a majority of body iron is in the form of hemoglobin, with a lesser amount existing as protein bound stored iron, myoglobin and cytochrome. The spleen contains iron in high concentration with lower level found in the liver, kidney and heart.
Iron in meat

Iron in catalase

Catalase is a high-efficient enzyme for the degradation of hydrogen peroxide into water and molecular oxygen, mainly expressed in cytoplasm, peroxisomes and in mitochondria.

Although catalase is generally distributed in nearly all living tissues its concentration varies enormously from tissue to tissue. In mammals the greatest quantity occurs in the liver and in the erythrocytes.

Protoporphyrin IX

Iron is introduced into both hemoglobin and catalase at the time erythrocytes are form and this iron remains firmly bound for the lifetime of the red cell.

The iron appears to be present only in the ferric form and cannot be reduced chemically by any procedure that does not denature the enzyme.

Catalase contains four identical subunits each quipped with a high-spin Fe (III)-protoporphyrin IX (7-9). However, approximately one of the four subunits contains an inactive high-spin Fe (III)-biliverdin complex.
Iron in catalase

Iron in peroxidase enzyme

Iron is present in enzymes like peroxidase, catalase and cytochromes, thus playing an active role in the electron transport systems of the body which release energy in the cells.

Peroxidase contains hemes and it is important as antioxidant enzymes, protecting cells from damage by hydrogen peroxide.

The immune system also relies on a heme containing enzyme myeloperox9dase, which produced by white blood cells which engulf bacteria and kills them.

Peroxidases are widely distributed in nature and they participate in many important physiological functions. This enzyme catalyzes the oxidation of a variety of reducing compounds at the expense of the reduction of H2O2 to H2O.

Myeloperoxidase is found in neutrophils, where it assists in the antimicro0bal activity of the cells by forming oxidized halide species as well as singlet oxygen.
Iron in peroxidase enzyme