> If this theory is correct, does it mean that a drastic change in diet might change a person's behavior? I'm imagining a future where people match their diet t

> If this theory is correct, does it mean that a drastic change in diet might change a person's behavior? I'm imagining a future where people match their diet to their intestinal bacteria to increase or reduce the "waste" that gets produced to achieve a desired mood or behavior. The concept is really not new. Diet has long been linked to mood and behavior in traditional medicine. It wouldn't be a shocker to learn that some traditional approaches to dietary therapy are actually effective, though probably not for the reasons they proclaimed.