Microbiome
Inside your sealed kimchi jar, the microbiome is the bustling mix of hundreds of bacterial species competing and thriving as acidity shifts, turning simple veggies into pungent, living food.
The microbiome is the complex community of microorganisms—including bacteria, fungi, viruses, and archaea—that inhabit a specific environment, such as the human body, soil, or food. It encompasses the collective genetic material of these residents and plays essential roles in health, digestion, immunity, and ecological balance.
What this means in real life
When you take antibiotics, they kill harmful bacteria but also wipe out beneficial ones in your gut, sometimes causing digestive upset until your microbial community rebuilds itself over weeks.
What it isn’t
It is not a single organism or a disease. Many people assume it refers only to harmful bacteria, but the vast majority of your microbial community is beneficial or neutral and essential for health.
Commonly misused online
Social media often treats it as a cure-all—claiming probiotics or specific foods can 'fix' your microbiome and solve any health problem, when the science is far more nuanced and individual.
Based on 3 reference sources, including primary sources. Last verified July 12, 2026.