Health does not merely mean absence of disease or physical fitness. It can be defined as complete physical, mental and social health.
Health is affected by the following things :
(1) Genetic Disorders : Those imperfections with which a child is born and those imperfections which the child inherits from the parents since birth.
(2) infection and
(3) Our lifestyle which includes the food we eat and the water we drink, the rest we give to our body and the exercise we do, the nature we have and those we lack, etc.