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Additional Biology - AQA Unit B2 - Science - YouTube

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All the key ideas which you need to know for Additional GCSE Biology, in manageable chunks. Just the important things you need to know. This playlist specifi...

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AQA GCSE Core Science and Biology unit 1 (B1). Most videos needed for this unit are covered.

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Excess carbohydrates or fat can lead to obesity.
Hormonal problems can lead to obesity, though the usual cause is a bad diet, overeating and a lack of exercise
Obesity can cause health problems such as; arthritis (inflammation of the joints), type 2 diabetes (inability to control blood sugar level), high blood pressure (due to eating too much salt)and heart disease and problems (due to eating too much salt). There is also a risk of getting some kind of cancer.
Too much saturated fat can increase blood cholesterol level.

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Energy is needed to fuel the chemical reactions in the body. These reactions are called your metabolism. The speed at which it happens is your metabolic rate.
People with a higher proportion of muscle to fat in their bodies will have a higher metabolic rate.
The bigger you are, the more energy your body needs to be supplied with

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Carbohydrates - Release energy
Fats - Keep you warm
Protein - For growth, cell repair, and cell replacement
Fibre - To keep everything running smoothly through your digestive system
Vitamins and Mineral Ions - To keep your skin, bones, blood and everything else generally healthy