This is done now with the “do not resuscitate” order. No food, no water, just morphine.
Been there.. twice. And they take advantage of the presence or absence of one with medical power of atty, which is ignored often depending on the state of residence.
About 15 years ago, my, now, husband ended up in the hospital. They flat out told me, alter, that if he had had a DNR, he would have passed away. Fortunately, after he awoke, he was determined to be competent enough to designate me POA.
I tell people all the time to not sign a DNR.
Oh, and, my husband is doing very well, thanks to terrific medical care at that hospital and then the VA hospital.
I remember a doctor (IIRC a noted rabbi as well, but I’m
not 100% certain) saying “DNR” DOES NOT MEAN “DO NOT TREAT”
If it wasn’t he, it was another at the same conference.