This depends on a lot of factors. There are some type II diabetics like this: they might need insulin after a meal with a high glycemic index, but not after a meal with a low glycemic index. There are some type II diabetics with more advanced disease who need insulin after eating anything. Type I diabetics entirely lose their ability to make insulin, which is why the disease was fatal before insulin was discovered, no matter what the kids (it was almost always kids) ate or didn’t eat. As a general rule, it is inaccurate to equate diabetes with unhealthy eating. The Venn diagram only overlaps.