This falls into a "YMMV" category - your mileage may vary. I have been successfully using this dressing on my salad during P2 and continued to lose weight. I use 1 Tbsp instead of the Tbsp of milk for the day. It covers a lot of salad nicely and is so delicious I look forward to it almost every day.
1 cup mayo (regular mayo, I used Kraft)
1 tsp ranch seasoning (some have msg, so watch for that)
1/4 - 1/2 tsp onion powder
1/4 - 1/2 tsp garlic powder
1/4 - 1/2 tsp paprika
black pepper to taste
1/2 - 3/4 cup buttermilk, to desired consistency
Mix all ingredients well.