ABSTRACT: The gut may be considered the mammalian second brain and its maximal function is related to many factors including diet, lifestyle, stress, exercise and a balanced microbial environment. How do we discern the intelligence quotient (IQ) of the gut and its impact on our metabolic, mental and sexual health? Why is it messed up? In this neolethal age, factors include: poor maternal transfer, dietary impact, pharmaceuticals (acid blockers, antibiotics, vaccines, hormones), poor water quality, excessive hygiene, heavy metals and other toxicants. Which inhabitants in your rainforest are endangered or extinct? Farming our gastrointestinal terrain to achieve a diverse, robust balance of bacteria, microbes and biofilms not only mends the gut but also fulfills the ever expanding role of the biome: immunomodulation, the brain-gut axis, fermentation, vitamin synthesis, hormone production, and detoxification. Happiness, effortless body fat loss and hormonal health can result when the rainforest in the gut is optimized.