The latest salvo in Macro-Nutrient Land is the Calorie Restriction Diet, inspired by animal experiments in which mice, guppies,
water fleas, yeast, spiders, Labrador retrievers, a
microscopic water invertebrate called the rotifer, and rhesus monkeys are said to live longer on diets that restrict caloric intake.13 Researchers are encouraged by the longevity of a single monkey who has reached 38 years on a diet in which the portion of monkey chow — dried compressed pellets of wheat, corn, soybean, alfalfa, fish and brewer's yeast — has been cut by 30 percent compared to controls.