I'm a Jenny Ruhl fan too. Her's was the second book - after I'd run away from Bernsteins saying I can't do that diet.
Ruhl's book eased me into managing my diabetes.
I flogged my Bernstein book on Ebay a month after I got it...Where my head was then, life would not have been worth living.
Then I began to gently get around to the Idea, You tube really helped me. Once I got to know the principles behind what they advocated, it was easier to wrap my head round the whole concept.
I am actually eating lower than Bernstein's 6-12-12, because I do OMAD most days. but when I can't for any reason eat just once, the second meal of mine is a piece of meat or fish.
Anything into my mouth I consider a meal now.
I tested 5.1 ketones two days ago, that spooked me. I ate some Greek yogurt. On further research, I found out that that was quite a good therapeutic level of ketosis, apparently that level goes beyond BG and weight loss benefits.