© Oxford University Press 2008 7.5 Foods are compounds What are the three main food groups we need? carbohydrates proteins fats These are all compounds.

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Presentation transcript:

© Oxford University Press Foods are compounds What are the three main food groups we need? carbohydrates proteins fats These are all compounds

© Oxford University Press Foods are compounds Carbohydrates are made from carbon, hydrogen and oxygen

© Oxford University Press Foods are compounds Fats are also made from carbon, hydrogen and oxygen, but have different numbers of atoms and are arranged differently from carbohydrates.

© Oxford University Press Foods are compounds Proteins are also made from carbon, hydrogen and oxygen PLUS nitrogen.

© Oxford University Press Foods are compounds What else? There are other important things we need in our diet as well: Vitamins Minerals

© Oxford University Press Foods are compounds What are minerals? Minerals are compounds with metals in them. We need: calcium: for bones and teeth phosphorus: for bones and teeth and to help muscles to work iron: to carry oxygen in the blood

© Oxford University Press Foods are compounds... and sodium What compound do we eat that gives us sodium? sodium chloride

© Oxford University Press Foods are compounds What does sodium do for us? It helps muscles and nerves work It helps maintain the right level of water inside the body It regulates blood pressure

© Oxford University Press Foods are compounds How much salt and sodium do you need? You need no more than 2400 milligrams (2.4 grams) of sodium per day. This is the amount of sodium in 6 grams, or 1 teaspoon, of salt.

© Oxford University Press Foods are compounds What happens if you take in too much salt? We think that too much salt in your diet can lead to high blood pressure. High blood pressure is one of the main causes of heart attacks and strokes in the UK.

© Oxford University Press Foods are compounds New-look food packaging