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Human Nutrition and Health

Protein, carbohydrate and fat: functions and sources

  • 3 things to know
  • A2 7

Overview

Three macronutrients, main dietary function of protein and essential amino acid.

What you need to know

Answer each one before you reveal it.

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Key term

State four functions of fat in the diet.

Key term

Distinguish saturated from unsaturated fat and give a source of each.

Key term

Name the three macronutrients.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Name the three macronutrients.

    Model answer

    The three macronutrients are protein, carbohydrate and fat.

  2. 2

    State the main dietary function of protein.

    Model answer

    Protein supplies the amino acids needed for the growth of new body tissue and the repair and replacement of existing tissue.

  3. 3

    Give three functions of protein besides growth and repair.

    Model answer

    Protein is also used to make enzymes, hormones and antibodies, contributes to fluid balance in the blood, and can be broken down for energy when carbohydrate and fat are insufficient.

  4. 4

    What is an essential amino acid?

    Model answer

    An essential amino acid is one the body cannot make for itself, so it has to be supplied by food.

  5. 5

    Distinguish a high biological value protein from a low biological value protein.

    Model answer

    A high biological value protein supplies all the essential amino acids in useful amounts, while a low biological value protein is short of one or more of them.

  6. 6

    Name three plant foods that provide high biological value protein.

    Model answer

    Soya, quinoa and the seeds of the hemp plant provide high biological value protein from plant sources.

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