Just for the record....
Should I ever be incapacitated, up to and including what some hack doctor might view as a "persistent vegetative state," it is my firm wish not to be starved to death.
My wife, Heather, also desires not to be starved to death under these circumstances. [This may not seem like sufficient evidence on Heather's behalf, but even though I'm not a guy banging some tail on the side who stands to profit from the demise of the woman I promised to love, honor and cherish, till death do us part--that should be enough. It was for Mr. Schiavo.]
It may be strange to say, but I don't in fact know of any of my friends or family who have ever expressed a desire to be starved to death under any circumstances.
Hope that's "clear and convincing" enough for the judicial system.
May God have mercy on us all.