This is the correct answer. And the conspiracy baiting on this is Shameless. A lot of people simply don’t or won’t change their lifestyle. And that in large part means lots of carbohydrates. I have people in my family who’ve largely cut out carbohydrates. It’s very hard and very inconvenient. There’s very few places we can go fast food wise that they can actually eat much of any of it. Cooking at home means cooking a small separate carbless version for them. It’s a massive disruption to most people’s lifestyle and not at all easy. Everyone whether on insulin or not would benefit from eating less carbs. It’s damned hard though.