For overall health it is also important to understand that body needs movement and all neural pathways are also somewhat independent and also contain "intelligence".
I am not neurobiologist so hope I am not going into mumbo-jumbo too much but I workout at the gym quite often and can observe over-training or how muscles often could still work but your neural pathways are done and you cannot hold the weight even if muscle/tendons feel quite fine on its own.
It is also quite common knowledge as I read on the internet stuff on training.
So in the end I don't feel body-mind separation is useful as much and thinking that your whole body is also ones mind is super important.
If your brain is anxious, you can consciously use breathing techniques to trick it into thinking you're calm. Box Breathing for example works pretty well. Or just taking 2-3 really deep slow breaths.
An anxious/nervous brain defaults to short shallow breaths for some reason.
I've read summaries of these studies as well, but... the adrenal cortex doesn't have any sensory-processing facilities, right? In the end it's the brain that informs the adrenal gland?