I was pretty stable from initial diagnosis of Type 2 when I got my bloods down from an hba1c of 144 to 57 in three months in late 2015. (Also morbidly obese, so Type 2 was most likely despite clear indicators it probably wasn't, even then - they were ignored.)
They began to creep up which I blamed on Christmas and being out of routine (!) and began walking in the New Year as strict eating was doing no good. This helped keep me pretty steady, stable and was what we all attributed continued weight loss to along with LCHF eating.
Come late 2017 absolutely nothing was working, hbA1c was now into 60s and over the radar for attention, cue the "You're not doing enough with diet and exercise," from doctor, explosion of outrage from me ("What part of halving my body weight and walking 8 - 10 miles every day is not doing enough?"), which then went to "You've got to expect this to progress." and the next review saw me refusing outright to see this doctor again, my nice DSN had moved practice and I was reluctantly persuaded to see a new GP. Which was the best thing as he took things much more seriously, looked at the history, referred me to the clinic, who diagnosed LADA, put me on insulin fast and there we are today.
Consultant and I agreed I'd probably saved myself from an emergency DKA hospitalisation purely because I'd kept accurate records, knew myself well (I was on the verge of suggesting ketone testing at the next GP appointment or walking into A&E), had eaten sensibly for my blood sugars and that the exercise had helped overall more than anything.
Also, we agreed if I had been a classic Type 2, rather than the LADA I really was, I'd been going about helping myself in the very best ways and my walking being one of the best of all. (Doctors all happy about my LCHF. Dieticians and nurses were hysterical, but couldn't argue I was basically healthy on it, about from this extreme hyperglycemia and starvation levels of ketones, and had no answer when I pointed out my meter didn't cope if I did eat carbs so why eat them if the point was to keep my blood sugars down?)
Today, the walking helps keep blood levels at safe levels. I have no qualms about eating more carbs than I have been, but nowhere near what I used to pre-initial diagnosis. as long as I'm going to walk them off, and I stick to non-wheat grain carbs, preferably gluten-free. A smidgeon of weight has gone back on, which is why I'm doing longer walks again this summer and two or three pounds have already shifted