We've only just started making the connection between the gut and our health, but 2500 years ago Hippocrates was bang on the money when he said "All disease begins in the gut."
Today, we recognise the connection between gut and health for a whole host of different health issues, and most especially thyroid-related conditions and autoimmune diseases.
Well, one cause of hypothyroidism (where your body doesn't produce enough hormones) is leaky gut syndrome; when the walls of your intestine literally 'leak' bacteria and other nasties into your bloodstream, triggering your body to produce antibodies. Ordinarily, your antibodies will fight off foreign invaders and restore the body to good health. With leaky gut, the condition is ongoing, so your antibodies continue the attack, causing chronic inflammation and tissue damage. It's one of the most common causes of autoimmune diseases such as Hashimotos.
Conversely, your thyroid contributes to the health of your gut by releasing important hormones which help manage gut inflammation.
Put plainly, you can't have a healthy gut without a healthy thyroid, and you can't have a healthy thyroid without a healthy gut.
Recent reports have suggested that probiotics, such as kombucha and kefir, can help by enhancing the production of special proteins that line the gut, reducing your risk of inflammation and even potentially reversing leaky gut syndrome.