Essays on Infinite Lifespans
them with substances such as DNA, proteins or drugs. 
There are already at least four major scientific conferences on
bioMEMS and other approaches to developing micro- and
nano-scale machines to go into the body and bloodstream.
Ultimately, the individualized nutrients needed for each
person will be fully understood (including all the hundreds
of phytochemicals from plants) and easily and inexpensively
available, so we wont need to bother with extracting nutri-
ents from food at all. Just as we routinely engage in sex today
for its relational and sensual gratification, we will gain the
opportunity to disconnect the eating of food from the func-
tion of delivering nutrients into the bloodstream.
This technology should be reasonably mature by the 2020s.
Nutrients will be introduced directly into the bloodstream by
special metabolic nanobots. Sensors in our blood and body,
using wireless communication, will provide dynamic infor-
mation on the nutrients needed at each point in time.
A key question in designing this technology will be the
means by which these nanobots make their way in and out
of the body. As I mentioned above, the technologies we have
today, such as intravenous catheters, leave much to be desired.
A significant benefit of nanobot technology is that unlike mere
drugs and nutritional supplements, nanobots have a measure
of intelligence. They can keep track of their own inventories,
and intelligently slip in and out of our bodies in clever ways.
One scenario is that we would wear a special nutrient gar-
ment such as a belt or undershirt. This garment would be
loaded with nutrient bearing nanobots, which would make
their way in and out of our bodies through the skin or other