What does meditation do to your body?

Medication can benefit in may things such as removing pain from injured areas, helping you to get better and many others some of which that i will have listed below. but most medications such as antibiotics help our body to fight the infection such as viral infections and lifelong diseases such as Arthritis, Diabetes. AIDS, malaria, HIV, cancer and many others some of which are very rare and we haven't even heard of. That is why we need medication otherwise the whole of the world population will die out in matter of years due to us no getting the correct medication that we need to survive in the big wide world.