End of Year Exams

This set of revision cards covers all the KS3 topics done in year 8, with summaries and levelled questions with answers.

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  • Created by: Meghna
  • Created on: 02-05-10 12:34

A Balanced Diet

Balanced Diet

A balanced diet is contains all the food groups needed for your body in considerable amounts. If you do not get enough of one type of food you will suffer from malnutrition.

The Food Groups:

Carbohydrates are split into two categories, sugar and starch. The carbohydrates are needed for energy.

Protein is important because it helps growth and cell repair.

Fats as used as a source of energy. They are also used to help keep the body warm because there is a layer below the skin that is made up of fat and it prevents heat escaping the body. Also, a fatty substance surrounds some nerve cells and it provides insulation for the electric signals

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Food Types

Minerals are needed but in very small amounts, two important minerals are iron for making red blood cells and calcium for strong bones and teeth

Vitamins are needed for the body but again in very small amounts. Two important minerals are vitamin C for repair of skin and D for taking up calcium

Fibre is used to keep the large intestine working well.

Water is to prevent dehydration

Fibre is important because it prevents constipation and keeps everything moving in the gut. Fibre mainly consists of cellulose which is found in a plant cell (it forms the cell wall in plants) It cannot be digested by the body and adds bulk to the food, this helps it push along through the intestines.

Some people take vitamin and mineral supplements (tablets) instead of the real thing. In some case they take too many which leads to side affects.

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Is my diet OK?

You can take your 5 a day in any form: fresh fruit and veg, as juices, canned dried or frozen or in a salad. They provide vitamins, minerals and fibre and decrease the risk of cancer.

Fish is an excellent source of protein and contains many minerals and vitamins. Oily fish such as mackerel and salmon, are rich in omega-3 fatty acids. These acids aer good for the brain and help the heart stay healthy.

The body needs salt to little salt can stop the brain and muscles working properly but too much salt causes too much water too be kept in the body. This leads to swelling of the hands, feet and abdomen. It also causes a higher blood pressure and increases the persons risk of a heart attack.

Do not skip meals because research shows that if you skip a meal you tend to eat more snacks during the day.

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Eating Food

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