Via KurzweilAI, an interview on radical life extension - and re-engineering the human body - that I missed the first time around. I think it illustrates Kurzweil's viewpoint fairly well - for all that Fantastic Voyage is a good introduction to optimizing health, I can't say I think he's performing a wonderous service by getting into the supplement business. Kurzweil's advocacy for rapid progress towards the technologies of radical life extension is a far more valuable contribution: "The golden era will be in about twenty years from now. There will be some applications earlier, but the real Holy Grail of nanotechnology are nanobots, blood cell-size devices that can go inside the body and keep us healthy from inside. ... Whatever we don't get around to finishing with biotechnology, we'll be able to finish the job with these nano-engineered blood-cell sized robots."
Link: http://www.kurzweilai.net/meme/frame.html?main=/articles/art0648.html