This is true but the purpose of such lists of rules is that they are easy to follow for people who otherwise would have no idea what to do. Every rule has excep

This is true but the purpose of such lists of rules is that they are easy to follow for people who otherwise would have no idea what to do. Every rule has exceptions and once someone tries such a system for a time they'll probably learn them. Having them avoid such food until then and start eating healthier right now would be more beneficial than waiting. Most of rule #2 would be encapsulated by rule #1 anyway, it just reinforces it.