Leena Watts
Trace metals are a subset of trace elements, which are minerals present in small but measurable amounts in animal and plant cells and tissues. Some of these trace metals are essential for human nutrition and physiology, and play a role in hundreds of bodily functions. For example, iron is essential for activating enzymes and making important amino acids, neurotransmitters, and hormones. Other trace metals such as zinc, copper, manganese, chromium, and molybdenum are also important for human health. While ingestion of or exposure to excessive quantities of certain trace metals can be toxic, insufficient levels of certain trace metals can cause pathology.
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What You'll Learn
Iron is essential for making blood cells and activating enzymes
Iron is a trace metal that is essential for human life. It is present in the human body in small but measurable amounts, and is the most abundant trace metal in the body. Iron is crucial for making blood cells and activating enzymes, and it plays a vital role in various metabolic processes.
Iron is essential for the production of hemoglobin, a protein found in red blood cells that is responsible for carrying oxygen from the lungs to the tissues throughout the body. About 70% of the iron in the body is found in hemoglobin. Additionally, iron is a component of myoglobin, which is similar to hemoglobin but found in muscle cells. Myoglobin accepts, stores, transports, and releases oxygen.
Iron is also important for proper immune function and is involved in respiration and energy metabolism. It is a component of enzymes that participate in the synthesis of collagen and certain neurotransmitters. A healthy diet that includes a variety of whole grains, lean protein, dairy products, and unsaturated fats can help ensure adequate iron intake.
Iron is not produced in the body and must be obtained from the diet. There are two types of iron in foods: heme iron and non-heme iron. Heme iron, derived from the digestion of hemoproteins in meat, is more easily absorbed by the body and is found in red meat, poultry, and fish. Non-heme iron, on the other hand, is obtained from plant sources and is not as easily absorbed, but it is still a good source of iron for individuals who do not consume meat. Foods rich in non-heme iron include greens, fortified breakfast cereals, beans, dried fruits, and eggs.
Maintaining optimal iron levels is crucial as both iron deficiency and excess can lead to serious health issues. Iron deficiency can lead to anemia, while excessive iron levels can cause tissue damage and have been implicated in neurodegenerative diseases. Therefore, it is important to work with a healthcare professional to determine individual iron needs and ensure adequate iron intake through a balanced diet or supplements.
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Zinc supports a healthy immune system
Trace elements, or trace metals, are minerals present in living tissues in small but measurable amounts. Some of these trace metals are essential for nutrition and physiology, and they are depleted through the expenditure of energy by various metabolic processes.
Zinc is a trace metal that is critical for supporting a healthy immune system. It is the second most abundant trace metal in the human body, with the body containing around 2-3 grams. Zinc has long been associated with optimal immune function, and its anti-inflammatory and anti-oxidant properties have been well-documented. Zinc is required for the development of a specialised type of immune cell and helps a critical immune organ regenerate after damage.
The thymus, an organ in which T cells develop, is often underdeveloped or non-existent in people with low zinc levels. T cells are essential for fighting infections. When zinc is introduced to zinc-deficient people, their thymuses grow and start producing these immune cells.
Zinc deficiency is also associated with abnormalities in the development of the embryo and poor health in newborns, due to disturbances in immune cell development. It is also linked to chronic inflammatory diseases that appear later in life.
Zinc's role in supporting a healthy immune system is particularly relevant for transplant patients. Prior to a blood stem cell transplant, patients receive treatments that wipe out their bone marrow and kill off any remaining cancer cells. As zinc is required for the development of immune cells, supplementing with zinc could help promote immune recovery in transplant patients.
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Chromium is needed for normal carbohydrate metabolism
Trace elements, or trace metals, are minerals that are present in living tissues in small but measurable amounts. They are essential for human nutrition and physiology, and their absence can cause pathology.
Chromium is one such essential trace element. It is needed for normal carbohydrate metabolism, and its biological function is closely associated with that of insulin. Chromium functions in carbohydrate, protein, and lipid metabolism as a potentiator of insulin action. Insulin provides cells with glucose for energy and helps maintain blood glucose within a narrow range of concentrations. Chromium supplementation has been shown to correct glucose intolerance in deficient individuals.
However, the precise composition and structure of the biologically active form of chromium are not known. The essentiality of trivalent chromium, the most stable oxidation state of chromium in biological systems, is questioned, and its proposed function in the body remains poorly understood. In 2014, the European Food Safety Authority concluded that a dietary requirement or adequate intake could not be set for trivalent chromium as no conclusive evidence exists that chromium is essential at any dietary intake.
Nevertheless, chromium is naturally present in a wide variety of foods, including fruits, vegetables, meat, fish, and grains, though only in small amounts. It is also available as a supplement, and these supplements have been shown to improve glucose metabolism in chromium-deficient individuals with diabetes. However, the American Diabetes Association does not recommend chromium supplements for people with diabetes who do not have underlying nutritional deficiencies.
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Manganese is involved in the metabolism of biogenic amines and regulating carbohydrate metabolism
Trace metals are metals that are normally present in small but measurable quantities in animal and plant cells and tissues. They are a necessary part of nutrition and physiology. Manganese is one such trace metal. It is an essential element that plays a role in the normal functioning of the brain, nervous system, and enzyme systems.
Manganese functions as a cofactor in activating a large number of enzymes that form metal-enzyme complexes. It is also an integral part of certain metalloenzymes. Manganese is involved in the metabolism of biogenic amines. Biogenic amines are implicated in a wide range of behaviours, ranging from central homeostatic functions to cognitive phenomena such as attention. There are five established biogenic amine neurotransmitters: the three catecholamines (dopamine, norepinephrine, and epinephrine), and histamine and serotonin.
Manganese is also involved in regulating carbohydrate metabolism. It is a required component of MnSOD (manganese superoxide dismutase), which is responsible for scavenging reactive oxygen species (ROS) in mitochondrial oxidative stress. MnSOD is the primary antioxidant that scavenges superoxide formed within the mitochondria and protects against oxidative stress. A deficiency in manganese can cause impaired growth, poor bone formation, skeletal defects, reduced fertility, and abnormal glucose tolerance.
Manganese also helps with protein and amino acid digestion and utilisation, as well as the metabolism of cholesterol and carbohydrates. It helps the body utilise vitamins such as choline, thiamine, and vitamins C and E, and ensures proper liver function.
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Copper helps to catalyse chemical reactions
Trace elements, or trace metals, are minerals present in living tissues in small but measurable amounts. They are essential for human nutrition and physiology, and some are needed by living organisms to function properly.
Copper is one such trace metal. It is a transition metal that can exist as two or more different ions in compounds, for example, copper(I) oxide (CuO) and copper(II) oxide (Cu2 O3). Copper is a catalyst, a compound that speeds up chemical reactions by lowering the energy barrier between reactants and products. Copper catalyses the oxidation of acetone (propanone) via heterogeneous catalysis. In this reaction, the copper catalyses the oxidation of ketene, methane, and acetone, providing the necessary heat to keep the copper glowing. The oxygen in the flask is quickly absorbed by the primary reaction, and the effluent gases are mostly carbon dioxide and water, with small amounts of ketene.
Copper-based catalysts are also widely used in chemical industries to convert water and carbon monoxide into hydrogen, carbon dioxide, and methanol. This process is used in the partial oxidation of methanol, the synthesis of methanol and other derived fuels from CO2, and the production of hydrogen. Copper catalysts are also used in the water-gas shift reaction, the conversion of esters to alcohols, and the selective hydrogenation of oils.
In addition to copper, other trace metals that play a role in human health include iron, lithium, zinc, chromium, nickel, cobalt, vanadium, molybdenum, manganese, and others. These trace metals are essential for various physiological processes, such as carbohydrate metabolism (chromium and manganese), bone health (calcium), and oxygen transport (iron).
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Frequently asked questions
Trace metals are a subset of trace elements, which are metals normally present in small but measurable amounts in animal and plant cells and tissues.
Trace metals are essential for the correct functioning of the human body. For example, iron is necessary for making blood cells and activating enzymes, while manganese is important for regulating carbohydrate metabolism.
Trace metals can be found in a variety of foods, including fruits, vegetables, beans, meat, fish, milk, and dairy products. For example, good sources of iron include red meat, lentils, beans, and fortified cereals.
Insufficient levels of certain trace metals can cause health issues. For example, iron deficiency can lead to anaemia, while manganese deficiency can affect enzyme function and carbohydrate metabolism.
