Diet and Exercise

Diet and Metabolic Rate


  • For good health, your diet must provide energy
    • Carbohydrates release energy
    • Fats keep you warm and provide energy
    • Protein fuels growth, repairs and replaces cells
    • Fibre keeps everything moving in teh digestive system
    • Vitamins and minerals keep skin, bones and blood all healthy


  • Energy fuels chemical reactions called metabolism
  • The speed of these reactions is called metabolic rate
  • Muscle needs more energy than fatty tissue
    • People with more muscle, have a higher metabolic rate
    • Fatter people need more energy than smaller people because they have more cells
    • Men have higher metabolic rate as they usually have more muscle and are bigger
    • The more active you are, the more energy you need
1 of 3

Factors Affecting Health

Unbalanced diet=Malnourishment

  • These people can be fat or thin or generally unhealthy

Eating too much:

  • Excessive carbs and fat intake
  • Obesity (20% or more over recommended body mass)
  • bad diet, overeating, lack of exercise
  • Type 2 diabetes
  • high blood pressure
  • heart disease
  • some cancers

Eating too little:

  • slow growth, fatigue, poor resistance to infection, irregular periods
  • Deficiency diseases casue problems with skin, bones, joints and gums.
2 of 3

Factors Affecting Health

Exercising regularly = healthier lives

  • Increases the amount of energy needed
  • decreases energy stored as fat
  • builds muscles and boosts metabolic rate
  • reduces risk of health problems (obesity)

You can be physcially fit and healthy, but still be malnourished from unbalanced diet

Inherited Factors

  • metabolic rate affected by:
    • underactive thyroid gland
  • inherited factors may affect blood cholesterol levels
    • which increases risk of heart disease.
3 of 3


No comments have yet been made

Similar Science resources:

See all Science resources »See all Health, diet and exercise resources »