The liver uses choline to break down cholesterols in order to create hormones and the like. In a body that is too acidic (precisely the environment where candida thrives), cholesterols get oxidized and there you get the beginning of bile stones.
Phosphatidylcholine (supplemental) has been quoted as helping a great deal in liver flushing, together with ox bile (bile is primarily cholieric materials).
Chicory root is one of the herbals rich in choline (alongside dandylion root). Both are known as herbs that benefit the liver.
Foods that are (relatively) high in choline: coffee (think coffee enemas), salad greens, some nuts, fruit.