The nice thing about upping fats at first when getting off all the nasty carbs is threefold, fat makes you full and satisfied, fat doesn't raise blood sugar (much) and it's easier to back off fat than it is carbs.
For me (NOT EVERYONE) - I just stopped eating sleazy carbs (and the bad oils and processed foods), I upped the green leafy/stemmy type veggies, protein and fats. That went on for a good while. I dropped weight, firmed up. I was doing various exercises. My BG came down a little, good but then I plateaued. I made some other changes, two meals a day, etc. Really helped my BG, weight stayed about the same but still plateaued. This is over many months. Then I backed off the fats a little, adjusted my supplements and increased my weight training. My BG readings finally started popping below 100. Even after a healthy meal, I can get a 10-20 pt rise, which is good for ME. If I cheat a little (no one is perfect) I can spike up to 150-160 (used to spike 190-200!) but I drop back rapidly, within an hour. My insulin does respond and seems like my body is dealing with sugar properly.
But I still don't know my fasting insulin level.
Tuesday is my first official blood draw since August. Appointment a week after. I have requested and OK'd for insulin level and full lipid panel along with A1c.