P.s. Any natural food that causes you to poop, is normally something you SHOULD eat. One of the most important properties of good food is its natural water content and ability to help with elimination which is the hot bed of all disease. The intestines, home of the immune system.
Not really a fan of the prune. From a taste standpoint, maybe they are not the worst thing. But texturally (especially stewed and all swollen up and mushy) I find them repulsive.