Gut bacteria—the trillions of microorganisms living in your digestive tract—may not be the sexiest subject, but it’s a hot topic in the health world lately. And for good reason: Over the past decade, research has brought to light how your gut microbiome (that’s what science types call it) plays a role in almost every aspect of health, including digestion, immunity, fat storage, and heart health.

Studies suggest a healthy gut may even help clear up skin conditions, such as eczema and acne, and may make you less susceptible to stress, anxiety, and depression—a finding that’s earned the microbiome the nickname “second brain.”

Source: Probiotics Benefits: How Foods Affect Gut Health | Greatist