You know that side dish when you order a Reuben sandwich? Well, that’s what you call Sauerkraut and it is a bacteria-filled food that can help improve your digestion. It is made of cabbage and then, it undergoes the fermentation process. If you encounter pasteurized Sauerkraut, it’s not the same as the regular ones. Pasteurization can kill the good bacteria and we don’t want that.