Here's something I wrote a bit ago on Unschooling Basics that might help. Every time this topic comes up the natural foodists assume the discussion is about how their beliefs are wrong. But it isn't. It's about how Mom can hold strong beliefs AND open the world to her kids so they feel free and supported in deciding what's right for them—even if it's counter to what mom believes. You've painted a picture of a mom with extreme convictions. Someone who believes that an aspect of mainstream society is toxic.
Joyce responding to an extreme example:
4:44am Feb 4 (2013)