Low blood sugar for someone with type 2 diabetes begins at blood glucose levels of 70 milligrams per deciliter. Treating low blood sugar, or hypoglycemia, is crucial for diabetics because they can suffer seizures or comas if it's left untreated, according to Healthline.
Diabetics can develop low blood sugar if they skip a meal, exercise more than usual or drink alcohol without food. In addition, too much insulin or too much of other medications that raise the insulin level can result in low blood sugar, notes Healthline. Symptoms of low blood sugar include confusion, light-headedness, passing out, sweating or chills, and rapid heartbeat. A diabetic experiencing these symptoms should eat 15 grams of carbohydates immediately.