I just had another thought about this part. The reason T1 diabetics lose weight is due to insufficient insulin secretion by the body, right? And this insulin is needed in order to store the glucose for later. So if you eat a high carb meal, and push your blood sugar up to 9 or 10 for the entire time the meal is digested, then you won't receive any nutrition from the meal.
By contrast, if you eat a low carb, high fat diet (which is what I'm currently doing), then you will gain weight because you are not relying on insulin to store the energy. So in my view, it is entirely consistent with T1 diabetes; not that I'm saying that's necessarily what I have!
Please do tell me if I've missed something here in my understanding of the processes.
Hi
It's not really like that, although I can see why it looks that way...
Most people lose weight on low carb high fat, certainly to start with. The reasons are quite complex, involving a number of things including smaller portions and greater satiety, because fat is so satisfying, the body switching to using fat rather than glucose as it's primary fuel (making it more practiced at using fat reserves as well as fat in meals), and for over weight type 2s, there is often something called insulin resistance, which plays a huge part when we eat carbs, and less so when we don't, esp if we are in ketosis.
Since you are not over weight, you have less reason for insulin resistance than most.
If you eat enough carbs and have insufficient insulin to cope, you still digest the food, and you still get the nutrition, it just doesn't get put away into the body's fat stores to keep for later. Instead, BG stays high (and it can go A LOT higher than 9 or 10), hanging around in the blood until the energy is used, or insulin eventually arrives (by injection or a belated phase 2 insulin response, or the kidneys filter it out, recognising how harmful it is - that's the excess peeing).
If you have been excess peeing, then you may have been dumping glucose in your urine. If not, then you will have been getting all the nutrition.
But there are so many different hormone and metabolic things going on in all of us that I'm afraid all that is a terrible over simplification!