The Prolongation of Life: Optimistic Studies

Drawing on his long career at the Pasteur Institute, the author examines why humanity has long been haunted by pessimism. He argues that many of our worst ailments stem from a mismatch between ancient biological traits and modern life, creating a persistent state of “disharmony.” By tracing the evolution of disease, old age, and even the fear of death, he lays a scientific foundation for a more hopeful outlook.

The book then turns to practical steps that might stretch human vitality. It highlights the role of intestinal microbes, recommending a diet that limits putrefying foods while encouraging lactic‑fermenting bacteria, and emphasizes clean living and preventive hygiene as weapons against illness. While the ultimate goal of dramatically lengthened lifespans may lie in future generations, the author shows how modest changes today can already lessen the burdens of senility.