We often operate under the false impression that we are and identity floating around in a brain, that is then housed within a body. Not only is this a rather medieval, pre-Darwinian mental model of experience, it is scientifically incorrect.
The human brain is merely the densest bundle of nerve fibers within a massive system that runs throughout the entire body. To believe that the brain is a totally dominant controller of the nervous system is equivalent to believing the largest tree in a forest controls that forest. Such a belief would lead one to a bizarre, pathological interpretation of all the phenomena within the forest. And if the forest began to operate under that model, it would become a rigid, barren place indeed.
No one part of a complex system such as a forest or our bodies can be said to have complete control or “intelligence” rather intelligence is that which arises from the simultaneous operation of millions of different systems nested within. The You being experienced now is an emergent entity, that though primarily manifested through the brain, originates in the organs, muscles, and diffuse nerve fibers throughout.
No wonder one gets a strange feeling when an otherwise brilliant person is out of shape and unhealthy. It is a strange contradiction to value the rational mind and personal expression over those components that make such abstract entities operational.
Consider yourself an anthill, not an identity floating in a meat suit.
Those many things that make up your moment to moment experience, though their function is not consciously noticeable are more important that what you can immediately identify as “me”.