In end-of-life circles, this option is called VSED (usually pronounced VEEsed), for voluntarily stopping eating and drinking. It causes death by dehydration, usually within seven to 14 days. To people with serious illnesses who want to hasten their deaths, a small but determined group, VSED can sound like a reasonable exit strategy.
Unlike aid with dying, now legal in five states, it doesn't require governmental action or physicians' authorization. Patients don't need a terminal diagnosis, and they don't have to prove mental capacity. They do need resolve.