Diabetic meals

There isn't a best meal but whatever you do have keep the carbohydrates down. Avoid refined white-flour based things such as bread, pasta and so on other than in small quantity

I'm not aware that nationality affects diabetes.

Or are you thinking about selecting from foodstuffs that are specifically available in African countries? If that is the case, then I'm afraid I cannot suggest specific foods, because my experience is limited to the standard Northern European diet.