By Hugo Francisco de Souza Reviewed by Susha Cheriyedath, M.Sc. May 14 2025 A new clinical study reveals that daily black tea kombucha can promote healthier gut bacteria, especially in people with obesity, by reducing harmful microbes and supporting beneficial ones. Homemade black tea kombucha. Image Credit: Ildi Papp / Shutterstock. Study:  Regular Consumption of Black Tea Kombucha Modulates the Gut Microbiota in Individuals with and without Obesity In a recent study in The Journal of