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Gut Bacteria Shape Mood, Behavior — and May Shape Your Decisions
basic-science diet-nutrition immunology mental-health stress-management
Your gut bacteria produce glutamate, GABA, and serotonin, and Stanford microbiome scientist Justin Sonnenberg's research makes clear that "your" mood, energy, and willingness to be social are partly their output, not purely yours. Michael Pollan takes that one step further: the bacterial drive to spread through handshakes, kissing, and shared currency may be shaping the very social behavior that spreads them. That is not a metaphor. It is a mechanism. The practical lever you actually control is diet: fiber-rich, minimally processed food feeds a diverse microbiome, which feeds the brain chemistry that feeds everything else.
Full analysis
Michael Pollan discusses research by Stanford microbiome scientist Justin Sonnenberg showing that gut microbiota — the trillions of bacteria living in the digestive system — produce critical chemicals for brain health including glutamate, GABA, and serotonin, as well as short-chain fatty acids that fuel the brain and reduce anxiety. These bacteria influence mood, energy levels, and how outgoing a person feels. They also transfer between people through ordinary contact: handshakes, kissing, and even exchanging currency.
Pollan raises the somewhat unsettling implication that some human social behavior — the drive to interact with many other people — may serve the bacteria's interest in spreading their range, not just our own. He and Pollan agree that the relationship is genuinely two-way: humans have effectively outsourced the production of essential neurochemicals to these organisms, which is itself a form of control. The practical upshot is that diet choices directly shape which bacteria thrive, which in turn shapes mood and cognition — a finding that supports prioritizing fiber-rich, minimally processed foods that support a diverse microbiome.
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