This is a book explaining the importance of gut flora. ★ The factory of "happiness substances (neurotransmitters)" in the brain is located in the gut, and this is called "gut flora (intestinal bacterial flora like a field of wildflowers)." If that bacterial flower garden is maintained, people can live longer... ※ Title: Gut Revolution ※ Author: Koichiro Fujita ※ Publisher: Kairyusha ※ Price: 1400 yen + tax Almost "brand new." The "carved wooden boy" used for the spread is not included. Thank you for looking.