Like "I believe 4 carbs actually refers to 4 carb exchanges with each exchange around 15 grams of carb. I have found it easier and more accurate to actually count the grams of carb in each food. Depending on who you read/follow, different carb exchanges can have different values..The guy who wrote "Think Like a Pancreas" ascribes 13 grams of carb for "Dairy exchanges" if I remember's just too confusing for me."