if you are surviving on earth and do not know why health matters ?
then understand by this explanation
Each and every creature on Earth has its Time limit to live a life
Nature its is a creature and creator
there are many more circumstances to live for a life
every life needs few basic things to survive
Air
Energy
food
water
in simple words as you are Practical thinking person
compare your body with anything available
for example
Machine (if any part of machine got damaged will it work function properly)
Fruit (if you found fruit is infected of having an insect , will it be useful any more for you ?)
or you can take example of anything
just like that Human body works
Human body is a combination of many things
if anyone of them got infected or stop functioning complete human Body will stop working and Breathless Body is useless for everyone
here is the link To Take care of Health [Human Body] [Nature]
Good Food Good Body
Good Nature Good Life