Mike, I don’t think it is helpful to make sweeping statements like this. Whether one is vegan, carnivore or something in between, it is the formulation of the way of eating that will determine whether or not it is helpful for managing diabetes. The medication that is being taken (if any) will also need to be taken into account.
This is much more helpful. Eating low carb, especially very low carb requires a lot more planning and thought if animal products are limited or excluded, but it is not impossible.
"Vegetarian diet" is a sweeping statement. At face value plant based diet is much worse for diabetes than meat based. As a sweeping factual satement plan based food has more carbs than meat. Many plant based food are mostly just carbs, some actually are nothing but. As you said your self "it is the
formulation of the way of eating".
In other words the effort you put into your diet. And limiting yourself to vegetarian diet requires much more effort. Reversely with same amount of effort you get better results for diabetes as omnivore than you would with the vegetarian diet. So veganism itself does not help.
Question was not "is it possible to lower BG while on vegan diet" it was "
Does vegetarianism help lower blood sugar"
And no, it does not
HELP. At all. Not in any way.
Sure, you can nit pick how you could lower you BG while eating vegan food. But that would have absolutely nothing to do with vegan diet. You could just as well add moderate amount of lean meat and fish to whatever BG lowering "vegan" diet and not only would that be just as good but I would guess it would actually be better.
Many people have misconception that as vegetarian diet is generally healthier it is generally better for diabetes. That is not true.
Nuts are healthy, just not if you are allergic to them.
While on subject of misconceptions "Whole grain". For diabetes the carbs are the enemy. Grain regadless of it's type is almost all carbs. Some carbs are worse than others, but there are no good carbs.
Tolerance to carbs in general and each type of them varies from person to person.
Only way to know how your body reacts to any food or diet is to test and measure. Measure BG, eat little no more than 10g carbs, then measure after 1,2,3 hours. It your BG stays in acceptable levels than it is ok. If it raises less than with some other food/diet then it helps to "lower" BG (by not raising it so much) .
Switching to veganism might also help (motivate) person to also switch to low carb diet. So what ever works, but itself veganism does not help lower BG.