Comment by D-Machine

Nutrition science is not science in almost any of the ways a real science needs to be, and there is almost zero "real, good science" to be found in it. The reasons this statement is true (as well as the precise qualifications of the exceptions to this) are well laid out by tsimionescu in response to your post.

The measurement, control, confounds, and even basic concepts are atrocious here, this is possibly the only field as bad as or even worse than e.g. social psychology. And this is all ignoring the massive economic interests involved.

It is in fact only science illiteracy that would lead one to think nutrition science is a serious science. At the most absolute charitable, it is a protoscience like alchemy (which did have some replicable findings that eventually led to real chemistry, but which was still mostly nonsense at core).