Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Dr. Roy Walford Is Growing Old Very Badly!

A devastating exposé in a recent issue of Modern Maturity reveals that Roy Walford is so enfeebled that he cannot walk. He is only 76. Most 76 year olds can walk a few steps on their own.This important fact demands full disclosure in all of Walford's books. Why has not Dr. Roy Walford revealed it so we can decide if we want to buy his book and his regimen? To hide this fact is at the very least unethical on his part, and on the part of his publisher. So Buyer Beware!I believe the scientific evidence is abundant that caloric restriction can retard aging and extend life. So obviously Dr. Walford has either not really been on it, or has not done it right!I for one am not interested in an anti-aging guru who grows old faster, more horribly, than normal people on a junk diet.