The connetion between my health and my feeling

I think that there is something who connction the health and the feeling because I have realy examples from my life to this statement.
My examples are something like walking,when I do walking (it doesn't matter who you are with)it's make me feel more happy than I was before and make me more healthy(it's causes to adrenaline in the body).
It's frees me from sterss before and even burning calories.
More examples is when I eat .
When i eat it's make me unhungry and make me less stress,but if I eat too much is not make good to my health.
If this happens to you a sign that there are really something whe connection between your health and your body.