CBSE Class 9 Science Why do we fall ill Notes

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Good health is a very hard thing to measure, but it is one of life's most precious things. The World Health Organisation has defined health as a state of complete physical, mental and social well-being.

Community health can be defined as "All the personal health along with the environmental services for the importance of health of community".

Some of the health services are given below:

(i) Establishment of health care services like primary health centers, district hospitals, community health centers, medical colleges, all Indian institutes, regional hospitals etc.

(ii) Provision of safe drinking water and proper disposal of garbage.

(iii) Prevention of harmful insect breeding sites.

(iv) Management of different types of environmental pollution by Central and State Pollution Control Boards.

(v) Preventive vaccinations against number of diseases like tuberculosis, diphtheria, whooping cough, tetanus, measles, hepatitis, etc.

(vi) Provision of family planning advices and services.

(vii) Provision of medical care to school going children.

(viii) Prevention of food adulteration.

(ix) Health education.


There are several conditions which have to be fulfilled for good health. The important ones are

(i) Nutrition,

(ii) Proper habits, and

(iii) Exercise and relaxation.

(i) Nutrition


Nutrition can be defined as the procurement of substances necessary for growth, development, maintenance and activities of a living organism. We obtain food from various plant and animal sources. In order to keep healthy and energetic, we need to take food. It takes care of the daily energy need also. We consume energy even while sleeping. Energy requirement depends on individual, age and special need. Growing children, pregnant women and nursing mothers need more energy.

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