Edexcel IGCSE Biology

Revision Notes

2.5.7 Humans: Balanced Diet

The Importance of a Balanced Diet

  • A balanced diet consists of all of the food groups in the correct proportions
  • The necessary key food groups are:
    • Carbohydrates
    • Proteins
    • Lipids
    • Dietary Fibre
    • Vitamins
    • Minerals (mineral ions)
    • Water

Food Groups Functions & Sources Table

Balanced diet table, IGCSE & GCSE Biology revision notes

Vitamins and Minerals 1, downloadable IGCSE & GCSE Biology revision notes
Vitamins and Minerals 2, downloadable IGCSE & GCSE Biology revision notesVitamins and minerals are required for many specific functions of the body.


  • Having an unbalanced diet can lead to malnutrition
  • Malnutrition can cause a variety of different health problems in humans

Causes & Effects of Malnutrition Table

Effects of Malnutrition table, IGCSE & GCSE Biology revision notes

Dietary Needs of Individuals

  • The nutritional requirements for individuals will vary throughout their lifetime
  • An individual will still require the same key food groups, but in different quantities depending on a number of factors such as age, height, sex, activity levels, pregnancy and breastfeeding

Variations in Dietary Requirements Table

Balanced diets table, downloadable IGCSE & GCSE Biology revision notes

Author: Ruth

Ruth graduated from Sheffield University with a degree in Biology and went on to teach Science in London whilst also completing an MA in innovation in Education. With 10 years of teaching experience across the 3 key science disciplines, Ruth decided to set up a tutoring business to support students in her local area. Ruth has worked with several exam boards and loves to use her experience to produce educational materials which make the mark schemes accessible to all students.

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