Healthy Eating

Attention: open in a new window. PDFPrintE-mail

Article Index
Healthy Eating
Weight Problems
Revision Activities
All Pages

Don't forget to try the revision activities associated with this unit by clicking here

A healthy diet contains the right balance of different foods that you might need and the right amount of energy.  A healthy diet contains:

  • carbohydrates
  • proteins
  • fats
  • vitamins
  • minerals
  • fibre
  • water

If your diet is not balanced you are malnourished.  This may lead to you becoming too fat or too thin.  It may also lead to deficiency diseases.  The baby in the photograph is suffering from the deficiency disease kwashiorkor caused by insufficient protein in the diet.  The thinning of the hair and swelling of the cheeks are signs of this.  The swollen areas around the baby's lips are signs of vitamin B deficiency as well.


The metabolic rate

This is the rate at which chemical reactions in the cells of the body are carried out (in particular, respiration) and varies with the amount of activity you do and the proportion of muscle to fat you have in the body.  For example, a person who has lots of muscle will have a higher metabolic rate than a person of equal weight who has more fat.

The less exercise you take and the warmer it is, the less food you need.  People who exercise reuglarly are usually fitter than people who take little exercise.  If you exercise you metabolic rate will normally remain high for some time after you have finished.