The Gut-Brain Connection
Your gut talks to your brain
The gut-brain axis is a bidirectional communication highway. Your gut produces 95% of your serotonin and directly influences mood, cognition, and even Alzheimer's risk.
The vagus nerve highway
The vagus nerve carries signals from gut to brain in milliseconds. Gut bacteria produce neurotransmitters (GABA, serotonin, dopamine) that cross this highway and alter your mental state.
Match neurotransmitter to gut role
Match each brain chemical to its gut-related function.
This step is interactive — open the Thier app to try it.
Depression & gut health
See how gut health impacts mental health over time.
This step is interactive — open the Thier app to try it.
True or False
Probiotics can improve symptoms of depression.
This step is interactive — open the Thier app to try it.
Key Takeaway
Your gut is your second brain. Feed it diverse fiber and fermented foods to support both mental health and longevity through the gut-brain axis.