There are very confusing messages about what we should eat to be healthy, and this is especially so for those who have chronic health conditions like diabetes.
All of the research I have done suggests that low-carb is the way to go (for both good general health and especially for those with blood sugar control problems / diabetics). Think keto or carnivore.
And the healthiest food you can eat? Red meat! Yes, it goes against the message that it is the mainstream media but this really does seem to be the healthiest way to eat.
There is a lot of really good information FROM DOCTORS on YouTube. As someone diagnosed diabetic, you might like to check out Dr Ken Berry or Dr Jason Fung or Dr Aseem Malhottra on YouTube as a good place to start.