I can eat a spoon of salt, or yeast. It is not particularly good but I know what it is, and I know the toxic dose. I won't eat a spoon of sodium benzoate or E324 or I don't know which food additive, I can't buy it in a food store, it is not "food" by itself. So I don't eat it :-)
I'm not sure a big spoon of salt will make you any less sick than a big spoon of sodium benzoate, but that's fair. I definitely agree that people should avoid eating things they do not understand; I think most of my disagreement with your original post is semantic, but I do still appreciate it. :-)