What happens next?

How to pick a low calorie salad dressing
Look for oil, water, and vinegar.
These should be the three main ingredients in most healthy, low-calorie dressings. Accordingly, these should be the first three things listed on a bottle of store-bought dressing.
All the way down the list, there shouldn't be stuff you can't easily pronounce. In fact, the shorter the list, the better.