02/27/2026
Let’s talk about the gut–brain connection.
70–80% of your immune system lives in your gut. Most of your serotonin — your “calm” neurotransmitter — is made there too.
If your gut is inflamed or imbalanced, your mood and brain function can suffer.
Common disruptors:
• Bacterial or yeast overgrowth
• Food sensitivities (especially gluten and dairy)
• Chronic constipation or diarrhea
• Antibiotic use
For some, gluten can drive brain inflammation. Dairy contains casomorphin, a morphine-like protein that may affect mood in certain individuals.
Not everyone is sensitive — but some clearly are.
When the gut is irritated, mood often follows.
Your mood is not just “in your head.”
Often, it starts in your gut.