[header] How to pick a low calorie salad dressing [title] Look for oil, water, and vinegar. [step] 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.