I have been very interested reading this thread and have realised that stalled weight loss is happening to so many of us. I was diagnosed T2 in January 2014 and immediately went on the Newcastle diet and bought a second hand treadmill. By the end of June I had lost 6 stones and learned to run, which I did 6 days out of 7. Then I was ill and without trying lost another stone. So, was 9.5 stones.
Since then I have maintained the healthy eating and have continued to run, now 8k six days a week. However, over the years I have slowly gained weight and am now a stone heavier. Apparently this MAY be because of medication I have to take, though there is no empirical evidence that the drugs do cause weight gain, or stall weight loss. So, three weeks ago I went back on the Newcastle diet (and have found it much harder to stick to!) and in the first week lost 3 lbs and in the second week 2lbs, and then have lost nothing though I have stuck faithfully to the diet and have not cheated. It is quite depressing as I know I need to keep my weight steady if my BS levels are to be steady. I don't eat high fat as for some reason this seems so counter-intuitive to me - though of course I know that others have had a lot of success with this. It is all so complex!