It's natural to be healthy...

To get to first base, you must understand that it's natural to be healthy. Your body is made up of 200 million cells (or so), each of which has specific jobs to do. If the cells do their jobs, your body is healthy.

For example, your body has the ability to make every chemical it will ever need and what's more, it makes it in the exact composition and strength needed by your body. Your body even heals itself by making new cells to replace the old ones.

As long as you have all your body parts and each one is working properly you're healthy.