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Human Nutrition and Health

Energy requirements, basal metabolic rate and activity levels

  • 3 things to know
  • A2 7

Overview

Basal metabolic rate and physical activity level.

What you need to know

Answer each one before you reveal it.

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Key term

How does body composition affect basal metabolic rate?

Key term

Why do men generally have higher energy requirements than women?

Key term

Give two states of health that raise energy requirements and one that lowers them.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Define basal metabolic rate.

    Model answer

    Basal metabolic rate is the energy the body uses at complete rest to maintain essential processes such as breathing, circulation, cell repair and body temperature.

  2. 2

    Roughly what proportion of daily energy use does basal metabolic rate account for in a fairly inactive adult?

    Model answer

    Basal metabolic rate accounts for the largest single share of daily energy use in a fairly inactive adult, typically well over half of the total.

  3. 3

    How does body composition affect basal metabolic rate?

    Model answer

    Lean muscle tissue uses more energy at rest than fat tissue, so a person with more muscle has a higher basal metabolic rate even at the same body weight.

  4. 4

    How does age affect energy requirements?

    Model answer

    Energy requirements per kilogram of body weight are highest in infancy and childhood because of growth, and they fall through adulthood as muscle mass and activity decline.

  5. 5

    Why do men generally have higher energy requirements than women?

    Model answer

    Men on average have a larger body size and a greater proportion of lean muscle, which raises basal metabolic rate and therefore total energy need.

  6. 6

    Give two states of health that raise energy requirements and one that lowers them.

    Model answer

    Fever and recovery from surgery, burns or infection raise energy requirements, as does an overactive thyroid, while an underactive thyroid lowers the metabolic rate.

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