Hi Julie.. Type 2 diabetic here, and I’ve been injecting insulin for 19 years.. I know quite a bit from my own experience about insulin resistance as it relates to carbohydrate consumption..
It may not be wise to go cold-turkey in regards to eliminating carbohydrates, but I’ve done it periodically without any issue, or any kind of “withdrawal”.. In fact, my body adjusts very quickly, and I rapidly get to a point where I *don’t* crave carbohydrates, especially sugar.. Keeping in mind, I have a *voracious* sweet tooth, so for that to subside is good evidence..
Recently, I went almost entirely carnivore (very very little carbs), and the carb/sugar cravings disappeared.. And so, I’ve found that a carnivore-centric diet is the best to calm the carb cravings and level out insulin resistance.. Healthy fats are a large part of my diet as well — animals fats (including homemade chicken bone broth), and supplemental oils like Flax oil.. With the Omega fats in Flax, I’ve been able to go off blood pressure drugs and control it with that alone..
Personally, I also eat one meal per day, in the afternoon, but sometimes a bit of grazing in the evening (maybe a snack of nuts).. The whole 3-meals-a-day thing is very stressful for a diabetic and the constant monitoring of blood glucose and insulin injections, etc.. For years I’ve done this approach of one big meal per day, which is when I take the insulin and do post-monitoring, and so it vastly simplifies it.. But all that’s probably rather irrelevant for your brother.. Not too many are keen on intermittent fasting/one meal per day..
But that approach has also cleared the way to give me insights into how carbs effect the body and glucose management and insulin resistance.. Decidedly, high carb loading is stressful to the body and insulin resistance instantly shoots up..
One thing I learned is that animal protein is best *not* combined with any kind of carbohydrate.. This lowers stomach pH and improves bile production and quality.. I proved this out with myself.. Also, a good recommendation is to eliminate the entire grass family of grains, especially since they’re now GMO and sprayed with chemicals — wheat, oats, barley, rye, corn, rice, sugar, etc.. I’ve found great benefit with these eliminations.. If I eat them again, I can actually get pretty sick..
Hope this helps in some way.. Just my thoughts.. 🐦