The word translates into "sour white cabbage" in German. This ballpark and barbecue condiment is a probiotic powerhouse, says Rumsey. "Just avoid canned sauerkraut as it's pasteurized, meaning most of the healthy bacteria is killed." A cup of the stuff only racks up about 30 calories. And cabbage's naturally high fiber level helps keep your digestive system running smoothly and prevents constipation.