I have gone through this thread and given a downvote to every post that's giving dangerously-incorrect medical advice. Which seems to be most of them.
I don't expect anyone who's actually diabetic to fall for this; every T1 diabetic is in practice forced to become an expert. But, for the sake of confused bystanders: for a diabetic using insulin, fasting is dangerous. That's not an abundance of caution thing; we diabetics micromanage a key part of our metabolism using insulin, and if we leave the range of metabolic states we're familiar with we'll get insulin dosages wrong. The most likely outcome of trying to fast for a day would be being forced to abort the fast by hypoglycemia.
As a person with type 1 diabetes I would like to add that, just as one has to learn what amounts of insulin to inject when one first starts using insulin with his/her given diet, one would need to learn what amounts of insulin are appropriate for the days one is on this diet.
And if you had to abort the fast a few times before you home in on your insulin needs during the fast, that is not a life or death situation.
I feel you are being too cautious. Please chime in if you feel I'm being cavalier. Thanks!
I don't expect anyone who's actually diabetic to fall for this; every T1 diabetic is in practice forced to become an expert. But, for the sake of confused bystanders: for a diabetic using insulin, fasting is dangerous. That's not an abundance of caution thing; we diabetics micromanage a key part of our metabolism using insulin, and if we leave the range of metabolic states we're familiar with we'll get insulin dosages wrong. The most likely outcome of trying to fast for a day would be being forced to abort the fast by hypoglycemia.