AQA GCSE Biology sections: B1 1.1 and 1.2

◊ 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.

◊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.