Is 12 grams of sugar per gallon milk harmful for diabetics?

Milk does not normally contain added sugars. Lactose is the natural sugar found in milk. Lactose is metabolised gradually in the body, and so does not cause a blood sugar spike. Milk also contains nutrients that are important for people with diabetes, including protein and calcium. Therefore, 12 grams of sugar per gallon of milk is not harmful for diabetics.