Is the "putting T2 into remission" an actual, real phenomenon? I suppose it could be possible, but it just seems unlikely to me (although I'm no endocrinologist). The only place I've read about it in semi-plausible form is from the British journalist who went on a starvation diet and dropped like 30% of his bodyweight. Honestly, I don't think I can do that! I have lost weight from being on a low-carb diet, but I'm currently trying to stay stable (I am losing weight slowly on a "maintenance" calorie diet), and I'm under 20% bodyfat (I am much more heavily muscled than average, being a former athlete, so I am in the "overweight" by BMI category but quite lean).
I really suspect that the most likely thing going on in my family is some type of MODY or "idiopathic LADA" if such a thing exists. My great-grandmother, grandmother, all became diabetic in their 40s while being lean, healthy, and active. My mother is not insulin dependent but many other people in my family are. Youngest brother was diagnosed LADA at 23, my younger brother was pre-diabetic at 32 while being fit (he's one of those Spartan-race/Crossfit maniacs). My only real concern at this point is on two fronts: a) I'm a control freak and want to know what is going to happen over the next year or five; and b) I have a two month old son and would really like to know if he's at elevated risk.
Knowing the answers to a and b aren't going to change what I'm doing: keep eating low-carb, keep exercising (which I'd do anyways), and keep testing frequently to try and detect if something changes. Thanks for the reply! I know that 5.1 is considered "excellent" control, I just wish it didn't come at the price of eating so low-carb that my thinking is fuzzy and my exercise is affected!