No, but people frequently do change things like diet, sleeping patterns, exercise etc. on the basis of seeing whether they work for them.

And people often harm themselves immensely through inaction in the same areas.

People also change their breathing patterns all the time, or don't, without knowing what they're doing or not doing.

You're advocating a line of thinking that simply is not how most people live their lives, and never will be, because it would paralyse us.