If you've been wondering what foods contain probiotics, read on. They're a delicious way to get the good bacteria you need for a healthy gut. These naturally occurring bacteria are found in some fruits and vegetables and are known to aid digestion as well as lower cholesterol levels. Here are a few examples. Bananas: According to Adventis Health, bananas are a good source of probiotics. Buttermilk: Traditionally, buttermilk comes with probiotics. This is because the leftover liquid from making butter has live cultures. Another good source of probiotics is yogurt. Yogurt is made by fermenting milk as well as comes with a variety of gut-friendly microorganisms. Apples are also rich sources of probiotics. Another food source that's high in probiotics is sauerkraut. However, this is one of the oldest fermented foods originating in Asia. Kefir, another drinkable food source, contains probiotics. It's made from fermented milk or water, but you can also drink it.