Doctors have reported that vitamins (76) _{…………………………}  substances required for the proper functioning of the body. In this century, thirteen vitamins have been discovered. A lack of any vitamins in a person’s body can (77) _{…………………………} diseases. In some cases, an excess of vitamins can also lead to illness. For (78) _{…………………………}, sailors in the past were prone to suffer from scurvy that is a disease resulting from the lack of vitamin C. It causes bleeding of the gum, loss of teeth and skin rashes. Sailors suffer (79) _{…………………………} scurvy because they did not eat (80) _{…………………………} and vegetables. Fruits and vegetables contain vitamin C which is necessary for good health.

Vitamin B complex is (81) _{…………………………} of eight different vitamins. A lack of any of these vitamins will lead to different diseases. For instance, a person who has (82) _{…………………………} little vitamin B1 will suffer from beriberi, a disease that causes heart problems and mental disorders. A lack of vitamin B2 results (83) _{…………………………} eye and skin problems while deficiency of vitamin B6 causes problems of the nervous system. Too little vitamin B12 will cause anemia. The knowledge (84) _{…………………………} vitamin deficiencies caused certain diseases led doctors to cure people suffering from these illnesses by giving them doses of the necessary vitamins. Today, vitamins are available in the form of pills and can easily (85) _{…………………………} bought at any pharmacy.