The trillions of tiny creatures living in our bodies have been making headlines lately—and for good reasons. These good bacteria—particularly those in our gut—may improve digestion, boost immunity and—according to some preliminary studies—they may even help us get leaner. Research is still emerging on just how important these mighty microbes might be for our health, but the early results are promising. There’s plenty you can do now to encourage their growth. The most effective way is by eating foods packed with probiotics—good bacteria that live in your gut and show up in fermented foods. Add these seven fermented foods to your diet for a healthy dose of probiotics.