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Diet, Nutrition and Supplements

Macronutrients and a balanced diet

  • 3 things to know
  • Components 1 and 2

Overview

A balanced diet and its proportions, simple and complex carbohydrates and glycogen, fat and saturated fat, protein for weightlifters and athletes, iron, calcium and vitamin D, fibre and water.

What you need to know

Answer each one before you reveal it.

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Key term

What is a balanced diet?

Key term

What proportions of energy should come from carbohydrate, fat and protein for an active person?

Key term

Why is carbohydrate the main fuel for most sports?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is a balanced diet?

    Model answer

    A balanced diet contains all the nutrients in the right proportions for health and activity. The nutrients are carbohydrate, fat, protein, vitamins and minerals, with fibre and water.

  2. 2

    What proportions of energy should come from carbohydrate, fat and protein for an active person?

    Model answer

    A common guide is about 55–60% of energy from carbohydrate and 25–30% from fat. Protein supplies the remaining 12–15% or so.

  3. 3

    Why is carbohydrate the main fuel for most sports?

    Model answer

    Carbohydrate can be broken down quickly, either aerobically or anaerobically. Carbohydrate is therefore the main fuel for moderate and high-intensity exercise.

  4. 4

    How is carbohydrate stored in the body?

    Model answer

    Carbohydrate is stored as glycogen in the muscles and the liver. A small amount circulates as glucose in the blood.

  5. 5

    How do simple and complex carbohydrates differ?

    Model answer

    Simple carbohydrates, such as the glucose in sweets and sports drinks, are absorbed quickly. Complex carbohydrates, such as the starch in pasta and rice, release energy more slowly.

  6. 6

    What are the main functions of fat in the diet?

    Model answer

    Fat is the main fuel for low-intensity, long-duration exercise. Fat also insulates the body, protects organs and carries vitamins A, D, E and K.

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