The brain and body communicate through mechanical and chemical signals from organs, and regulating these internal conditions can significantly influence brain function and mental states.

“If you can learn a little bit about the mechanisms of self- sensing, of understanding what's going on in your internal millu, as we say, your internal environment, you will position yourself to do some very simple things that can lead to outsized positive effects on everything from sleep to body com”

The brain constantly regulates the body's resources ('body budget'), and emotional feelings are low-dimensional summaries of this metabolic state.

“your brain is running a budget for your body and it's not budgetting money it's budgeting glucose and salt and oxygen and water and all the nutrients that you need to stay alive and well”