An excerpt from this article about how “our bugs” (as I am fond of calling them) affect our moods and food choices:
…the authors believe this diverse community of microbes, collectively known as the gut microbiome, may influence our decisions by releasing signaling molecules into our gut. Because the gut is linked to the immune system, the endocrine system and the nervous system, those signals could influence our physiologic and behavioral responses.
“Bacteria within the gut are manipulative,” said Carlo Maley, Ph.D., director of the UCSF Center for Evolution and Cancer and corresponding author on the paper. “There is a diversity of interests represented in the microbiome, some aligned with our own dietary goals, and others not.
Full article here: “Do gut bacteria rule our minds?” Not much detail in there, just another respectable researcher lending credence to the idea that our bodies are not just bank accounts of calories, and cravings are not just emotional/psychological.