You might be falling for the "fallacy fallacy" (I'm assuming it's called that!). Just because something is a fallacy didn't mean the fallacious conclusion is false. So, the Natural[istic] fallacy says "it's natural, this is better", but whilst that reasoning is fallacious it doesn't mean that the specific natural thing (in the current focus "eating a balanced diet") isn't nonetheless better, despite the unsound argument.

Just in case. Many people think that a fallacy existing is proof of the contrary position, or at least they speak/argue/type as if that is the case.

The corollary of course is that despite the apparent fallacious reasoning you could be right.