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Vinegar is used to preserve a wide variety of vegetables and fruits, along with meats, fish and eggs. Preserving food with vinegar is called pickling. A short list of foods â¦ that are commonly pickled would include pigs' feet, herring, beets, cucumbers, onions, olives, peppers, peaches, pears, and watermelon rind.o preserve food the pioneers used salt, and vinegar and they could have sun dried the food and they might have had root cellars to keep the preserved food edible and cool.
All these food acids are added to make the food flavors sharper. Besides adding a distinct tangy flavor acids in foods also act as antioxidants and preservatives. This is the reason why vinegar is used to preserve fruits and vegetables in the form of pickles.The common acids in foods that are considered to be unwholesome acids are found in food products like tea, cocoa, pepper, rhubarb, spinach, etc.Body usually has its own systems for dealing with such acids in case they are consumed in excess. It usually processes these acids and pushes them out as waste materials.he common acids in foods that are considered to be unwholesome acids are found in food products like tea, cocoa, pepper, rhubarb, spinach, etc. Body usually has its own systems for dealing with such acids in case they are consumed in excess. It usually processes these acids and pushes them out as waste materials.