There are no specific tests to diagnose auto brewery syndrome. This condition is still newly discovered and more research is needed. Symptoms alone are typically not enough for a diagnosis. Your doctor will likely do a stool test to find out if you have too much yeast in your gut.
Fermentation is a process in which bacteria and yeast break down sugars. Not only does it enhance food preservation, but eating fermented foods can also boost the number of beneficial bacteria, or probiotics, in your gut.