Hi, welcome to the forum, the patients who are allergic to yeasts should stay away from the yeast containing foods. You can get the list
of the yeast containing foods from the net. Examples
of yeast containing foods are Bakery products like Cookies, cake items, pastries and sweet rolls, pretzels, rolls and breads. Beer and Alcoholic Beverages, Vinegar or
natural root beer, soy sauce, olives, sauerkraut and apple cider.
Cranberries doesn't contain yeasts. Hence, it can be safely taken.