Vinegar is an excellent preservative and a good household cleaner, but it is not a medicine or a weight-loss drug. Several popular books claim that vinegar prevents cancer and heart disease, lowers high blood pressure and helps you to lose weight, but here is no evidence to support any of these claims. One of the books explains that vinegar helps you to lose weight because oil and vinegar don't mix, so vinegar and your fat won't either.
Vinegar is nothing more than a mixture of 95 percent water and around 5 percent acetic acid, made from grapes, apples, rice, potatoes or other fermented plants. It is very low in calories, but the only way vinegar could possibly help you to lose weight is by causing you to eat lots of salads while you cut back on other sources of calories.