Good health is not just the absence of disease or illness, it is a state of complete physical, mental and social well-being. This means eating a balanced diet, getting regular exercise, avoiding tobacco and drugs and getting plenty of rest. Our bodies are like machines that require a balance of protein, carbohydrates, fat, vitamins, minerals and water to stay in good working order. Get the balance wrong and your health will suffer.
This is part of the Learning for Life and Work section of BBC Bitesize Secondary (KS3) level. For more Bitesize content head to bbc.co.uk/bitesize