"If you tell a lie big enough and tell it frequently enough, people will eventually come to believe it". What is an example of this happening today?
I would really rather that these were actual examples, and not conspiracy theories. We all have our own unsubstantiated ideas about what shadowy no-gooders are doing, but I'd rather hear about things that are actually happening.
I'm not sure where you're seeing this stated as the leading reason? It sounds like the straw man arguments by those who dismiss concerns with sodium intake. You may be interested in the following discussion https://sigmanutrition.com/episode375/
Sigma Nutrition is not related to the more recently trending term of Sigma Male and its brand of toxic masculinity if that is what you are worried about.