I think we all share the frustration of research being unable to give us conclusive answers about what works and what doesn't. Seems like good portions of nutritional studies over the past 100 years were either misinterpreted or even influenced by interested parties. We, the consumers, are paying the price.
Oh we do have answers on many questions. Just not 100% sure, because detailed experiments on humans are kind of hard to get through the ethic committee.
Reading the available Pop science books/articles on nutrition however will probably just confuse people than help them.
Well, as someone who has read some of the intermittent fasting, paleo and low-carb literature (including all of Taubes' monster tome GCBC) over the years, I continuously run into people pointing to articles (and perhaps studies?) of how all of the conclusions of these authors are incorrect and so we shouldn't believe the hype despite the dozens of pages of scientific references that some of these text propose.
I basically don't know who's right and who's wrong anymore, because everybody claims that everybody else has an agenda or is being intentionally misleading.
Having eaten paleo for several years and done low carb, keto, zig-zag and all that jazz under expert supervision, I still don't know if at the end of the day I'm killing myself. The chain of events that leads to atherosclerosis seems to be very poorly and inconsistently understood by mainstream medicine, and you hear vastly different interpretations of what your lipid panel numbers actually signify for your long-term health.