You can give full power and authority to a health care agent to make decisions for you, which you could make yourself if you had the capacity to make and communicate health care decisions. Authority can involve decisions regarding anatomical rights, autopsies and disposition of remains. The authority granted to the health care agent may contain whichever restrictions the principal deems appropriate. Therefore, a health care proxy may instruct the physicians on whether you would like artificial food and water as well as pain medication, because if you were able to communicate yourself, you could ask the physicians to withhold any of those items from your treatment.