Vitamins play a very important role in human health. The story of vitamins began more than 100 years ago when a Polish chemist extracted from rice polishings a crystalline substance. This substance could cure beriberi. The chemist called it "vitamin". Vitamins are necessary for the growth and health, development and general health of the body. Overdosage of some vitamins may be harmful, so people must take normal doses of them. In planning a nutrition program for a person, we must know that certain foods are the best sources of each body requirement. We must eat carrots, fish, oil and eggs because they contain vitamin A which protects eyesight, increases resistance to infection. We may find vitamin В in liver, yeast and eggs. It strengthens nervous system. Fruit and vegetables contain vitamin С which helps to recover after illness. We find vitamins D and E in milk, eggs, fish liver oil, yeast and soya. They help the body in formation of bones and strong teeth, improve poor blood circulation.

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1. Do vitamins play a very important role in human health?
2. When did the story of vitamins begin?
3. What are the vitamins necessary for?
4. What vitamin protects eyesight, increases resistance to infection?
5. Does vitamin D help the body in formation of bones and strong teeth?