You're in luck, the veggies in slaw are extremely low cal, all the calories are in the dressing: in the mayo, specifically. Buttermilk is a naturally low fat product. You might try substituting yogurt for the mayo in this recipe. If you want a super healthy lean coleslaw consider dressing it with vinegar alone, or vinegar with just a touch of oil. I consider this the ultimate diet food ~ it's satisfying and delicious.