There is a world food shortage, so regardless of their safety, our future is going to be filled with nanotecnology. Many scientists in Europe complain that the safety has not been proven. The particles are so small that nothing medical could be used to counteract them if anything does go wrong. Morgellons disease (forum here at Curezone) is suspected by many to be mainly caused by nanotech (other causes also).
The only thing that I know of that could interfere with them if something does go wrong in the body is FOOD GRADE diatomaceous earth (very small and can be ingested, used for detox flushes).
Morgellons is also called "THE fiber disease" because it grows fibers on the skin (and they glow,...irridescent).