Eat This, Not That! admits that drinking kombucha regularly doesn’t magically make weight melt off your body. However, “kombucha only contains 30 calories per cup—and once the taste is acquired, it can replace calorically-dense fruit juices or carbonated beverages.” They add that testing on animals has revealed drinking kombucha regularly may also encourage you to eat a less caloric diet.Next: Here’s a key ingredient you can get in every sip.2. Kombucha contains B vitaminsB vitamin capsules | Bet_Noire/ iStock. .