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Human Nutrition and Health

Vitamins: functions, sources and deficiency

  • 3 things to know
  • A2 7

Overview

Difference between a water-soluble and a fat-soluble vitamin, three water-soluble vitamins and main function of thiamin.

What you need to know

Answer each one before you reveal it.

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Key term

Describe the signs of scurvy.

Key term

Distinguish retinol from beta-carotene and give a source of each.

Key term

How is vitamin D obtained, and what supplement does United Kingdom guidance suggest?

Questions from this subtopic

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  1. 1

    What is the difference between a water-soluble and a fat-soluble vitamin?

    Model answer

    Water-soluble vitamins dissolve in water, are not stored in quantity and must be eaten regularly, while fat-soluble vitamins dissolve in fat and are stored in the liver and body fat.

  2. 2

    Name three water-soluble vitamins.

    Model answer

    Thiamin, also called vitamin B1, cobalamin, also called vitamin B12, and vitamin C are all water soluble.

  3. 3

    State the main function of thiamin.

    Model answer

    Thiamin is needed to release energy from carbohydrate and to keep the nervous system working normally.

  4. 4

    Name three good sources of thiamin.

    Model answer

    Wholegrain and fortified breakfast cereals, pork, and peas and other pulses are good sources of thiamin.

  5. 5

    Which deficiency disease results from a severe lack of thiamin?

    Model answer

    Beriberi results from a severe lack of thiamin, causing muscle weakness, nerve damage and, in some forms, heart failure.

  6. 6

    State two functions of vitamin B12.

    Model answer

    Vitamin B12 is needed to form healthy red blood cells and to keep nerve tissue in good repair.

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