Hang on a second - let's have a think about this - are we so sure that people with type 1 diabetes are intolerant to carbohydrate?
It seems to me a ridiculous notion.
What happens when someone with no insulin production eats carb/glucose? The body is unable to take the glucose out of the blood stream effectively. BG levels rise to the point that blood becomes like acid running around the body. The kidneys do their best to filter out the glucose, and wee becomes a stream of sugar.
You know how it goes, and it doesn't end well.
Would you say that somebody had an intolerance to cyanide or arsenic? To somebody who cannot produce insulin, carbohydrate (without an artificial source of insulin) would surely fall into the same category as a poison. Hence my conjecture - a ridiculous notion.
Just sayin'....
(Ducks head and runs for cover!)