Salad dressings are rich in ALA because most are made from soybean oil. ALA regulates the heart beat and keeps it from developing a life-threatening, irregular beat.
Dressings can be regular, low or non-fat, and used in moderation.
Mayonnaise, on the other hand, is not so light. A tablespoon can have a whopping 100 calories, all from fat. The middle and the end. Some things never change, including those basic nutritious foods that we should all make a part of our diet. The Food Guide Pyramid should be a daily map of your nutritional day.