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What is nutrition? It is the intake of all organic materials necessary for providing raw materials and energy.

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Introduction

Nutrition What is nutrition? It is the intake of all organic materials necessary for providing raw materials and energy. We should have a diet that provides us with energy and raw materials through organic and inorganic sources in the correct proportion. Malnutrition is the excess or shortage of the intake of necessary nutrients in the right proportions. Organic nutrients: 1. Carbohydrates 2. Proteins 3. Fats 4. Vitamins Inorganic nutrients: 1. Inorganic ions 2. Water Why do we need to eat? 1. We need the food to provide us with energy to be able to perform daily activities. The chief suppliers of energy in our body are carbohydrates and fats. ...read more.

Middle

These amino acids are made of carbon, hydrogen, nitrogen, sulphur and oxygen. Why we need proteins: 1. Used as building blocks for parts of cells 2. Contained within cell membranes 3. Help muscles move 4. Contained in cells as haemoglobin , carry oxygen to the parts of the body 5. Contained as collagen in bones and skin 6. Contained as Keratin in hair and skin 7. Some proteins are enzymes and help speed up reactions 8. Some proteins, act as anti-bodies and destroy viruses and bacteria 9. Some proteins are hormones, such as insulin that helps correct sugar levels in the body 10. Proteins are used up to provide energy if a person does not have carbohydrates or fats left in his body Fat structure: Made of glycerol and fatty acids Why we need fats: 1. ...read more.

Conclusion

The deficiency disease for vitamin D is rickets. Iron Needed in the production of haemoglobin, a red molecule, which is found in the red blood cells. Haemoglobin joins up with oxygen molecules and is then carried around the body in the blood to the cells that need it for respiration. No iron results in no respiration and hence no break down of food for energy. Deficiency of iron is anaemia (people feel tired easily) Water Metabolic reaction, in the cytoplasm can only take place with the presence of water Water helps transport substances; Blood plasma is mostly water with a lot of substances dissolved in it. Without enough water the blood becomes thick and then every cells will not be provided with nutrients. Water is also needed in chemical reactions Evaporation of water from the skin helps to cool us. ...read more.

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