Sauerkraut, or "sour cabbage," is an example of a fermented food that's loaded with lactic acid probiotics. These good bacteria provide you with many health benefits, plus they increase the shelf life of the sauerkraut because they act as a preservative. In other words, each batch of sauerkraut may contain varying species of gut-friendly probiotics in several proportions, making it a unique fermented food each time you get a new container. Another thing to keep in mind: Sauerkraut products that are pasteurized or processed often have little to no good bacteria left in them. Just know that, with certain varieties or brands, you might not be getting as much good bacteria as you think.