Nathan Pritikin was an American nutritionist and longevity research pionoeer. Diagnosed with heart disease in the 1950's, he engaged in a low-fat diet that was high in unrefined carbohydrates along with a moderate aerobic exercise regime. His dietary and exercise regime became known as the "Pritikin Program for diet and exercise." When his own disease improved substantially, he established the Pritikin Longevity Center in 1976 and served as its director....