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The gut and brain talk constantly through the vagus nerve, hormones and immune signals. When the body is in 'alert' mode the gut tenses too, and gut discomfort can feed back into a sense of unease — a loop that slow breathing can interrupt.
More than 90% of the body's serotonin is produced in the gut, which is part of why digestion, mood and sleep are so tightly linked.
Evidence on diet and the microbiome is genuinely promising but still developing; results vary between people, and lifestyle steps work alongside — not instead of — medical care.
References
Mayer EA. Gut feelings: the emerging biology of gut—brain communication. Nature Reviews Neuroscience. 2011;12(8):453—466.
Cryan JF, et al. The Microbiota-Gut-Brain Axis. Physiological Reviews. 2019;99(4):1877—2013.
Yano JM, et al. Indigenous bacteria from the gut microbiota regulate host serotonin biosynthesis. Cell. 2015;161(2):264—276.
Frequently asked questions
How do I calm anxiety fast?
Slow your breathing - box breathing (in 4, hold 4, out 4, hold 4) for a few rounds activates the vagus nerve and shifts the body out of alert mode. Grounding your senses and relaxing your belly also help quickly.
How can I calm my mind fast?
Pair slow, exhale-focused breathing with a brief brain dump, writing your worries down to park them. A longer exhale than inhale is particularly calming for a racing mind.
Can calming the gut help calm anxiety fast?
Often yes - the gut and brain talk constantly, so easing gut tension with slow breathing can interrupt the anxiety loop. Much of the body's serotonin is made in the gut, which is part of why digestion and mood are linked.
What's driving my anxiety?
The free 2-minute self-check above looks at the gut-brain factors behind anxiety and gives realistic next steps.
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