You'll discover the foods that are excellent for your gut in this book, How fermented book affected the gut The beneficial microbes that support our physical and emotional well-being have been replacing the ancient bacteria that maintain our gut in balance and digestion simple. There are entire microbial species that have vanished, leading to health problems that weren't frequent 100 or even 50 years ago. Small intestine bacterial overgrowth (SIBO), a quiet and serious epidemic that affects one in three people and is to blame for an incredible array of human health disorders, is one important effect.