AQA GCSE Biology sections: B1 1.1 and 1.2

Topics covered are:

  • diet and exercise
  • weight problems


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Diet and Exercise

A balanced diet includes everything that is needed to keep the body healthy e.g. Carbohydrate, fat and protein are needed to release energy and to build cells. Different people need different amounts of energy because the metabolic rate varies from person to person. If the energy (food) taken in is less than the energy used, the person will lose mass. The more exercise you do, the more food you need. Exercise increases the metabolic rate, which means chemicals in cells work faster. The proportion of muscle to fat in your body and your inherited factors can also affect your metabolic rate. If your diet is unbalanced then you can become malnourished.

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Weight problems

If you eat more food (take in more energy) than you need your mass will increase. Obesity can lead to health problems such as type 2 diabetes. Its unhealthy to be extremely underweight or extremely overweight.

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