Dietary science performs so ridiculously poorly compared to every other branch of science, that I can't simply chalk it up to the inherent nature of scientific

Dietary science performs so ridiculously poorly compared to every other branch of science, that I can't simply chalk it up to the inherent nature of scientific progress. There are a lot of variables and complex systems, yes, but you get whiplash from the way so many of these hypotheses turn out to be absolute bullshit every few years. Really the lesson should be that no one should place much confidence at all in any of these ideas until they've actually been supported by many sources for a very, very long time. Branding these things as "current scientific knowledge" is exactly the kind of thing that gets people doubting science, and it's an insult to the rest of science.