Lactose= shitty carb source, very high glycemic index! Just go by the glycemic index of the carbs. Low GI = good carbs, this does not apply however to milk, which has a low GI but a high Insulin Index, which is the amount of insulin secreated per unit of carb consumed. For the most part though II corresponds with GI, with the exception of milk. So all veggies, most fruit, oatmeal, just type glycemic index food list into a search function and eat those carbs w/a GI below 50 if the reference value is based on the GI of glucose.