I once tested a friend of mine who is not diabetic shortly after a meal, and her BS was 13! I flipped! But as it happened we were in the company of an actual doctor at the time, and he said that if you test a non-diabetic a very short time after eating, their blood sugar could be that high. Now that's a long time ago, and I can't say it's right, but I knew her for years after that and she had no signs of diabetes. So the "7.8" limit for non-diabetics may not be universal and it may be for two hours after eating (or some other specified time). Having said that I tray to maintain mine at 7.8 or less one and a half hours after eating. Better safe than sorry.