We all need it because-

• It helps us to grow
• Gives us energy to do work
• Helps to protect against diseases
• To keep our skin, hair, teeth in good condition.
• All systems of our body like brain, heart, lungs, and muscle require food.

If we don't eat a balanced diet, our body will not work well. We should think of our body as a factory. Each department of which will work well if it is provided with proper raw material. It is great fun to enjoy food but it is equally important that the food is balanced according to the needs of our body.

Carbohydrates
Carbohydrates, as a class, are found in nature. They are produced by green plants and by bacteria using the process known as photosynthesis. They are known as energy giving foods, e.g. Rice, potato and wheat, bread, sugar.
 
Proteins
Proteins are called body builders. They help to repair the wear and tear of the body. Milk, milk products, eggs, meat, fish, soyabeans, peas are growth promoting foodstuff. Growing children must have food that contains bodybuilding proteins.
 
Fats
Fats provide energy. e.g. nuts, ghee and oil.
 
Vitamins
They improve our appetite, help us to fight against diseases, keep our body fit. e.g. Green leafy vegetables, yellow vegetables, fresh fruits, are rich source of vitamins. Vitamin A in carrots is good for our eyes, Vitamin B in nuts helps  us absorb energy from other foods, Vitamin C in oranges and lemons protects against cold. Exposure of body to sunlight is a good source of vitamin D.
 
Minerals
Important minerals for our body are iron, calcium, zinc etc. They protect us against diseases. We get calcium from milk, cheese, and fish and get Iron from . Iron gives our blood more oxygen. Zinc is found in pulses, meat, seafood etc. 
To increase the nutritive value of food eat sprouted and germinated grains, pulses, and cereals. 

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