Aubrey de Grey,longevity researcher, professor emmeritus, degreed at Oxford Unversity, teaches now at Cambridge, holds several PhDs, his area of expertise is in longevity research,immortality, cellular biology, computer science, engineering and micrcrobiology, etc. See his stellar and distinguised academic background.
Aubrey de Grey published, based on his years of research and study,the cause of death in humans, save accident, is "INTRACELLULAR JUNK."
Where do humans get intracellular junk? From food.
See Aubrey de Greys works at:
mywiseOwl.com, his many published research papers can also be found by doing a search on Aubrey de Grey,immortality,longevity online.
or type in name, Aubrey de Grey at mywiseOwl.com
link:

http://mywiseOwl.com