I share your concern about acting quickly before there are complications... That is why I mentioned doing it in concert with a healthcare professional not on your own...
A trained healthcare professional is able to look at the data and make the judgement call as to whether diet alone is sufficient or should be in combination with medications.
However, that is not the point of the post, the post is meant to lay emphasis on the fact that alone can be a therapeutic method for diabetes.
I hope this clears things sir.