Diet Offers Tantalizing Clues to Long Life
LEAD: A FLIMFLAM ad writer could not have invented more outrageous claims. Here is a diet that extends lifespan by 50 percent or more. It prevents heart disease, diabetes and kidney failure, and it greatly retards all types of cancer. It eliminates or forestalls many of the usual banes of aging, including cataracts, gray hair and feebleness.