The moral of the story seems to be that every diabetic is different.
I was diagnosed type 2 about 17 years ago, didn't take very seriously, weight crept down from 20 stone, but Hba1c yo-yo'ed between 7.0 and 13.0. On lots of meds.
wake-up call this january, hba1c 10.5, GP suggesting insulin. I have low-carbed before, done Atkins etc, know it is the only way but struggle with will power. I think I have done it more robustly this time, feels like more of a lifestyle change, loads of supplements etc. Home a1cnow test suggests Hba1c down to 6.3 after 4 1/2 months. weight down from 16 st 6 lbs to 15 st 2 lbs.
Also managed to drop one Mertformin tablet and one Gliclazide (haven't told my GP yet)
It is working this time, I think, because for me high fat is what i need. read loads of recent books convincing me that saturated fat is good for you, so I have about 150ml double cream a day + coconut oil, butter.
I am convinced by advice in "diabetes 101", so trying to join 5% club (get Hba1c below 6), and trying to avoid spikes above 7.7 (but still happens 2 or 3 times a week - rarely above 10 now).
I don't think it matters how you do it. Everyone has different metabolism, different levels of will power etc, different carb tolerance levels. The aim for all of us is to avoid amputation/blindness at the end of the day, so test test test, eat to your meter, avoid big spikes, get your Hba1c down. You may do that with 80% fat or 50% fat, with fasting or without........doesn't much matter.
I think that once a diabetic, always a diabetic, but I'm already a bit more carb tolerant. Can now have 30 grams of Carb in evening meal (one box of micro-chips!), and usually peak at just under 8.0. Upper limit before was more like 20 grams.
I am hoping that if I get down to target weight of 13 stone, and get a little bit of improvement in insulin resistance + beta cell recovery, that I may be able to get away with 40-50 grams some time next year, but know i will always be diabetic, so low-carb and very high fat is essentially for the rest of my life.