I found most Glucerna bars are quite high in carbs and they do spike me. As with everything we eat the only way you know is to test them. Some foods that say they are safe for diabetics are really marketing scams. They are ways to part us from our money. I know Glucerna just came out with some new weight loss shakes. I'm not sure if they have bars too. As a general rule on a snack I like to see it under 5 net carbs.