Animal products have no carbs at all (except for milk which has milk-sugar). I think you meant to say "junk calories".
I was making an observation that the Vegan diet may/could also have a very low glycemic index, i.e. junk calories, just as a ketogenic diet like the Atkins plan does. It is simple carbs that trigger the insulin response.
A lot of foods which have simple carbs in them that you avoid on a ketogenic diet, such as Pasta and bread, contain animal products; eggs, milk, animal fat, etc., so a Vegan wouldn't eat them. Most of the Vegans are also very conscious about what they drink, favoring "all natural", "organic", etc., thus avoiding more junk calories in soda, refined juice, etc.
So, for controlling the insulin reaction, a Vegan diet *could* be effective for the same reason a ketogeninc diet is. Granted, not all vegans would make food choices that would result in a very low carb intake, but the opportunity is there.
In short, the study may have proven what we already know. Simple carbs from sugar and refined grains can wreck your blood sugar.
I read my first post again and see what you meant here. I mixed the metaphor so to speak.
It is interesting though. I would like to see the vegans diet plan. I bet it was low on the junk carbs. I am not diabetic, but battle my weight. If I avoid potatoes, white rice, bread, pasta and sweets - oh, and beer :(, I can eat all I want and won't gain an ounce. I put some simple carbs in and my clothes will immediately begin to shrink!