In a single day the body is asked to perform all the physiological functions that keep it alive, manage the stresses coming from its external environment, and navigate the emotional ups and downs of human life. Each one of these things is challenging for the body. All three are often taxing. The body is built to manage stress under the assumption and condition that the stress it is subject to is temporary and there will be a time during the day when the stress will end and the body will be able to rest and recover.
The body is a magnificently intelligent vessel that we have the honor of living in. It will manage whatever we put it through for days, months, years, even decades. I’ve now been working with human bodies long enough to see that the body will always put 100% of the energy and effort it has available into sustaining life and subjective life style at any given moment. It will do this until it just can’t anymore, until the resources are so low that it has to stop.