She says if I don't, I will continue poisoning my body. Processing and refining is necessary to make certain foods more digestible. Either may remove some nutrients, usually a very small amount, but they can be restored with nutrient additives.
Food additives are harmless, and most are used for good reason.
Antioxidants and preservatives, for instance, prevent food from spoiling. Studies indicating that Food and Drug Administration approved additives are harmful are seldom based upon feeding people the minute amounts found in food. They are almost always a result of feeding massive amounts of the substances to rats.