During the past few decades, high-profile cases like that of Terry Schiavo have fueled the public debate over forgoing or withdrawing artificial nutrition and hydration from patients in a persistent vegetative state (PVS). These cases, whether involving adults or young children, have forced many to begin thinking in a measured and careful way about the moral legitimacy of allowing patients to die. Can families forgo or withdraw artificial hydration and nutrition from their loved ones when no hope of recovery seems possible?

Many Catholics know that Catholic moral theology has...