Micronutrients and Their Functions

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Questions and Answers

What is the unit of measurement for micronutrients?

Grams

Liters

Milligrams (correct)

Kilograms

What is the term for vitamins that can be stored in the body?

Water-soluble

Electrolytes

Protein-bound

Fat-soluble (correct)

What happens if the body lacks vitamins?

Energy is produced

A specific deficiency syndrome occurs (correct)

Toxicity occurs

No symptoms occur

What is the main reason why vitamins cannot be synthesised by the body?

Complex biochemical pathways Signup and view all the answers

What are the two main categories of micronutrients?

Vitamins and minerals Signup and view all the answers

Why do fat-soluble vitamins not need to be consumed daily?

They are stored in the liver and fatty tissues Signup and view all the answers

What is the primary function of Vitamin D in the body?

To maintain normal bones and teeth Signup and view all the answers

What is the recommended daily intake of Vitamin D for adult males?

900 mcg/day Signup and view all the answers

Which of the following is a rich source of Vitamin D2?

Mushrooms Signup and view all the answers

What is the upper level of Vitamin D intake for adults?

3000 mcg/day Signup and view all the answers

What is the deficiency disease caused by lack of Vitamin D in children?

Rickets Signup and view all the answers

What is the function of Vitamin E in the body?

To protect cells against oxidative damage Signup and view all the answers

What is one of the functions of Vitamin B6 in the body?

Modification of steroid hormone action Signup and view all the answers

Which of the following food sources is richest in Vitamin B9?

Green leafy vegetables Signup and view all the answers

What is a consequence of a Vitamin B9 deficiency?

Megaloblastic anaemia Signup and view all the answers

What is the recommended daily intake of Vitamin B12 for adults?

2.4 μg/day Signup and view all the answers

Who is most at risk of Vitamin B12 deficiency?

Older people Signup and view all the answers

Which of the following is a source of Vitamin B6?

Poultry Signup and view all the answers

What is the primary function of calcium in the body?

To develop and maintain healthy bones and teeth Signup and view all the answers

What is the result of a diet low in calcium?

Low bone density, which can lead to osteoporosis Signup and view all the answers

Where is the majority of calcium stored in the body?

In the bones Signup and view all the answers

What is the name of the condition that results from a deficiency in a particular mineral?

Pernicious anaemia Signup and view all the answers

What is the role of hormones such as vitamin D in regulating calcium levels?

To keep calcium levels within narrow limits Signup and view all the answers

Which of the following foods is a good source of calcium?

Fortified soya products Signup and view all the answers

What is the recommended daily intake of calcium for children?

1.2 g/day Signup and view all the answers

What is one of the manifestations of hypocalcaemia?

Cataract Signup and view all the answers

What is the function of iron in the body?

Formation of haemoglobin in red blood cells Signup and view all the answers

What is the most bioavailable form of iron?

Haem iron Signup and view all the answers

What can inhibit the absorption of non-heme iron?

Phytate and Calcium Signup and view all the answers

What is one of the consequences of low blood potassium levels?

Heart failure Signup and view all the answers

Study Notes

Micronutrients

Micronutrients are required in tiny amounts for various bodily processes, but do not provide energy.
There are two main groups of micronutrients: vitamins and minerals, measured in milligrams (mg).

Vitamins

Vitamins are required in small amounts for essential processes in the body.
The absence or underutilization of vitamins causes specific deficiency syndromes.
Excess amounts of some vitamins may cause toxicity.
Vitamins are grouped into fat-soluble and water-soluble vitamins.

Fat-Soluble Vitamins

Fat-soluble vitamins can be stored in the body and include vitamins A, D, E, and K.
These vitamins are not required daily, as the body can build up stores in the liver and fatty tissues for future use.
Sources: fatty foods and animal products.

Vitamin D

Vitamin D is necessary for:
- Calcium and phosphorus absorption and utilization
- Normal blood calcium levels
- Maintaining normal bones and teeth
- Normal muscle function
- Immune system function
Vitamin D is obtained in two forms: ergocalciferol (vitamin D2) from plant sources and cholecalciferol (vitamin D3) from sunlight.
Sources: meat, egg yolks, liver, fatty fish, and fortified milk.
Deficiency: Rickets in children, osteomalacia in adults.
Toxicity: Hypervitaminosis D, leading to anorexia, nausea, vomiting, and bone aches.

Vitamin E

Vitamin E is an antioxidant that protects cells against oxidative damage.
Sources: unsaturated fatty acids, e.g., plant oils such as sunflower, corn, and olive oils.

Vitamin B6

Functions:
- Metabolism of amino acids
- Breaking down glycogen
- Modification of steroid hormone action
- Formation of red blood cells and metabolism and transport of iron
- Maintenance of normal blood homocysteine levels
Sources: poultry, white fish, milk, eggs, whole grains, soya beans, and peanuts.
Deficiency: Rare, but may occur as a complication of disease or prolonged administration of certain drugs.

Vitamin B9 (Folate/Folic Acid)

Sources: green leafy vegetables, brown rice, peas, orange, bananas, and fortified breakfast cereals.
Deficiency: Results in neural tube defects in newborns and megaloblastic anemia.

Vitamin B12 (Cyanocobalamin)

Functions:
- Normal formation of red blood cells
- Normal immune system and nervous system function
- Energy production
Sources: Found in almost all foods of animal origin, including meat, fish, milk, cheese, eggs, yeast extract, and fortified breakfast cereals.
Deficiency: Rare in younger people, more common in older people due to impaired absorption, resulting in pernicious anemia.

Minerals

The body requires minerals in small amounts for various functions.
Each mineral has a specific function and is required in different amounts.

Calcium

Functions:
- Development and maintenance of healthy bones and teeth
- Normal muscle contraction (including the heart)
- Normal blood clotting
Calcium levels in the blood are regulated by hormones like vitamin D.
Sources: dairy products, green leafy vegetables, fortified soya products, and fish eaten with the bones (e.g., sardines).
Deficiency: Low bone density, leading to osteoporosis.

Iron

Functions:
- Formation of hemoglobin in red blood cells
- Binding of oxygen and transporting it around the body
- Immune system function
- Normal energy metabolism
- Metabolism of drugs and foreign substances
Sources: Haem iron (from animal sources) and non-haem iron (from plant sources).
Lack of iron may lead to iron deficiency anemia.
Vitamin C helps absorb non-heme iron when eaten at the same time.

Potassium

Functions:
- Normal functioning of the nervous system
- Normal muscle function
- Maintaining normal blood pressure
Sources: fruit and vegetables (especially bananas), meat, fish, shellfish, nuts, seeds, pulses, and milk.
Low blood potassium levels: severe diarrhea, weakness, mental confusion, and, if extreme, heart failure.

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Description

Understand the importance of micronutrients, their sources, and functions in the body. Learn about the effects of deficiency and excess of each nutrient on health.