While it is good to diversify your food source to enhance diversity in your gut microbiota, there are certain types of fiber or bacteria that can help organize your gut microbiota.
I just saw an advertisement for Australia on Facebook and it was introducing some popular Australian dishes with colorful pictures. One of the dishes was avocado toast. As soon as I saw the photo, which was very eye-catching, I pictured myself sitting at a cafe in Australia and having it. Then, out of the blue, I felt it would go very well with natto.