wrt to his nutritional /supplemental writings in his latest books Kurzweil provides evidence in form of studies etc, or if not available or study was limited in relevance etc, he plainly acknowledges this. I thought it was obvious he was trying to fill gaps with what was available. He also acknowledges he is choosing to reinterpret some findings, and gives his rationale for this too. He also rejects a raft of homeopathic and modern medical treatment with same rationalization. He never claims to be a scientist, rather he says he is just a guy doing his best to leverage science from an engineer and inventor perspective for his own personal health benefit, and sharing it with the rest of us.