What is food?
  What happens to the food we eat?  
Our nutrient needs  
  Energy balance  
  Nutritional status  
  Laws & labels  
  Additives & colours  
  Toxicity in food  
  Processing food  
  Stability of food nutrients  
  Storage life of foods  
  Food- associated health problems  

- The total diet -

In following any diet or food fashion you should know why it recommends the eating patterns it does. The facts about food presented in this book will enable you to be more critical - to tell whether any new diet is merely a fad, or is soundly based and suitable to your particular needs.

For a safe and healthy diet, some foods should be eaten in relatively greater quantities than others, and these relationships can be represented by position in a 'pyramid'. The food pyramid in Figure 2 shows three categories of relative use:

  • the category at the base represents foods we should eat most days and in greater quantity

  • from the middle category, we should eat different foods on different days, and as wide a variety as possible

  • we can eat the foods at the top of the pyramid in moderation or occasionally.

More information about the nutritional characteristics of these food categories can be obtained by reference to Figure 3, and Figure 21.

Food Facts
- What is food ?
The total diet
- Knowing the natural sources of food
1: Components of food in the total diet
2: The food pyramid
3: Foods grouped according to biological source