Hi,
Like some others I am puzzled as to what you think you have to guess at and why you say you are trying not to eat meat.
After being diagnosed with T2D I changed from a High Crab Low Fat (= so called healthy heart lifestyle) to Low Carb High Fat.
I understand that LCHF doesn't suit everybody and that we are all different in out tolerance of carbs and our food like/dislikes and food tolerances.
The main change for me was breakfast which used to be porridge (boiled oats). Now it is 2 large boiled eggs. As part of my new LCHF lifestyle ( I count carbs - not calories) I have been eating more of the following: Eggs, Cheese, Butter, Cream, Full Fat Yoghurt , Red Meat, fattier cuts of meat, Nuts, Avocado, Salmon, Trout, Cauliflower, Broccoli.
I have lost over 11% of my body weight as a side effect from controlling my blood Glucose. I did not count calories, I did not do extra exercise, I did not feel deprived or hungry.
Whatever method you use to control your BG must be sustainable, it is for life - for a long and healthy life!
Thus, for me at least, a crash diet is not appropriate, imho they are not sustainable and worse still they reduce the metabolic resting rate meaning that you start burning fewer calories per day - which mean you have to keep cutting more calories again.