I think you're mistaken. Carb is the only macronutrient that is not required. The body can make glucose via gluconeogenesis. Take someone who has not eaten a single carb for a month and measure their blood glucose level and you will find a stable 90mg/dL. This is why Type-1 diabetics still need insulin (although much much lesser than otherwise) in spite of being on zero-carb diets.
On a keto diet, one can attain < 20g carbs per day with some struggle but to cut it out entirely is really hard without missing some other essential nutrients - because at least some carbs tag along with other things.
If you refuse to consign yourself to the fate that most MD's in the US describe for their diabetic patients (mine told me, "there's nothing you can do to improve it, other than some exercise, take the medicine, annual check ups, and then hope there aren't complications as you age"...I got another general practitioner), then self-support groups like this are the only way to go to find what works for you, IMHO. The Reddit group is also helpful when starting out, but I found them not as hardcore about control as I wanted, which I found in some members of the DD group.
That said, eating only animal products makes keto look tame in comparison.
That said, I'm keto and find it difficult to stay under 30 grams of carbohydrates per-day simply because carbs are in so many foods. I've, a few times, gone "strict" keto i.e 10g< of total carbs per day which includes indigestible fiber and I (anecdata coming at you) felt great.
https://www.amazon.com/Dr-Bernsteins-Diabetes-Solution-Achie...
Are you saying that "She's had several endocrinologists tell her that she needs to eat carbohydrates" is wrong and deadly? (There seems to be no other advice in mcone's post https://news.ycombinator.com/item?id=14812819 to which you are responding.) If so, are you adducing the book you link as your evidence?
Without knowing anything about that book or its author, I think that it's fair to say that any one persons's conclusions should be treated with profound scepticism. That's not the same as saying that they're wrong, but it does mean that calling contrary advice "wrong and deadly" seems very much to be excessively certain.
He is a well-known proponent of cutting carbs for all diabetics, even Type 1's, see his Wikipedia entry for an intro [1]. He's been open about his own Type 1, and:
"As of 2006, Bernstein had an HDL cholesterol of 118, LDL of 53, Triglycerides of 45, and average blood sugar of 83 mg/dl.[3] By 2008, at 74 years of age, Bernstein had surpassed the life expectancy of type 1 diabetics."
I wouldn't go as far as to say any carbohydrates is "wrong and deadly". However, OP you're responding to is correct: there is a metabolic pathway [2] that generates the necessary carbohydrates from fats and proteins in your diet if you don't eat enough. There are challenges with the ketogenic diet if not carefully followed, and it doesn't work for everyone [3].
0.14% of the diabetic population have qualified for a diagnosis of complete remission [4]. There is no cure, but some Type 2's can manage without medication and still diagnostically show no sign of Type 2 via blood glucose and HbA1c tests; those that maintain it for over a couple of years qualify as complete remission. I've found more of these people or diabetics approaching that level of control at the Diabetes Daily site than any other location on the Net [5]. Overwhelmingly, carb restriction is the first go-to they recommend all newly-diagnosed who want to join this small club try as among the first treatment protocols. Even many Type 1's report benefiting from not requiring nearly as much insulin after restricting carbs. It's worth investigating, if only to rule it out if it doesn't happen to work for your wife.
Good luck with your wife's Type 1.
[1] https://en.wikipedia.org/wiki/Richard_K._Bernstein
[2] https://en.wikipedia.org/wiki/Gluconeogenesis
[3] https://en.wikipedia.org/wiki/Ketogenic_diet
[4] http://www.diabetes.org/research-and-practice/patient-access...
Just for the record, not mine, but mcone's (https://news.ycombinator.com/item?id=14812819).
Carbs were only available in the summer/spring, and food became even more scarce in autum/winter. Thus, humans developed a powerful chemical response to carb intake - we crave carbs because they were the only means to fatten up and avoid starvation and death.
If you keep your incidental carbs low enough, they will be burned off without taking you out of the ketogenic, fat-burning state.
It is not the incidental carbs in these vegetables for which we might have a nutritional need, but the vitamins and minerals.