In light of recent research into the effects of calorie restriction on those little plants and animals that live in your gut, this would seem interesting: ''The intestinal microbiota is important for maintenance of host health, providing energy, nutrients and protection against invading organisms. Although the colonic microbiota is relatively ...

While not directly relevant to healthy life extension in humans, it is, I think, important to remember that immortality surrounds us: the immortality of cells, bacteria, and the material from old individuals that grows into young children. Avoiding age-related degeneration and death is quite possible for biological systems - it is an unfortunate ...