When your blood sugar levels are too low, eating something with carbohydrates can help. If you have diabetes, try to keep high-carbohydrate snacks on hand. The American Diabetes Association recommends that your snack have at least 15 grams of carbohydrates (National Institutes of Health).lood glucose meters are used to test blood sugar levels and will tell you if your level is below 70 mg/dL. If you do not have a blood sugar testing machine on hand and are experiencing signs or symptoms of low blood sugar, those symptoms may be enough to diagnose low blood sugar.