and you can do some experimenting on your own.
We're all a little different in our responses to carbs and sugars. Some don't produce enough insulin, others don't use it very well. And still others digest differently. Some things, like rice pudding and full sugar sodas are almost automatically no-no's, but others can be tricky. In my case, I found that bread is the big killer. Even wheat bread shoots the readings way up. Pasta, noodles, and Ben&Jerry's are out, too. Not entirely, but very little.
Read all the labels and beware of anything with a high carb count. And watch how they count the carbs--a can of soup may say it has 2 servings, so double the number if you eat the whole can. And don't pay any attention to "net carbs". The trick is they subtract the amount of fiber from the carb count, but those carbs are still there.
Exercise helps, too. Diabetes does not mean you can't burn off the carbs. It will work a little differently from nondiabetics, but still works.
I was shocked when I fasted for a couple of days and my reading went up to around 300. How could I have high blood sugar when I didn't eat any carbs? Turns out your body can make glucose if you don't digest any. Diabetes means your regulatory systems are screwed up, not that they don't work at all.
Good luck, and 200 isn't the end of the world, but high enough to be careful.