Yogurt
Yogurt is probably the most common probiotic food, and is regularly consumed in countries all around the world, although there are various claims about where it originated (Bulgaria and Turkey are popular choices). It is made by fermenting milk with different bacteria, which are left in the yogurt. meaning that eating it is good for our gut.
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Sauerkraut
Sauerkraut is fermented cabbage, which is particularly popular in Germany and the Alsace region of France. However, although its name is German it's believed to have originated in China, where cabbage was fermented in rice wine before Europeans caught on to it. Fermenting the cabbage not only makes it a probiotic food, but it is supposed to be easier to digest this way and full of nutrients such as B vitamins.