Understanding what it means to be human has radically changed in the last fifteen years. Similar to how we discovered the Earth was not the center of the universe, and that humans are not outside of nature's evolutionary story, we now understand that each human being is, in fact, a supraorganism. Each person contains more microbial cells than human ones. This app explores how we can take care of our interior critters and work together. When we get this wrong, our invisible inhabitants can hijack our reward systems, manipulate our cravings, and drive inflammation. When we get it right, we can lead happier, healthier, and more balanced lives. This app includes a simulator to see how your daily choices can change how we work together.
An introduction to the science of your gut biome can sometimes feel a bit overwhelming. Use the buttons above to choose how deep you want to go into the biology.
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We often view our digestion as a mechanical process, but the GI tract is actually an incredibly sensitive sensory organ that actively monitors what we consume and communicates directly with our brains.
Taste does not stop in the mouth. The gastrointestinal tract is lined with the same bitter and sweet receptors found on the tongue. As foods like fermented sauerkraut or buckwheat travel through the digestive system, the gut "tastes" and analyzes their chemical composition, sending satiety and metabolic signals to the brain long before digestion is complete.
Through the vagus nerve, bacterial populations can effectively manipulate our cravings. When we feed opportunistic bacteria the fast-digesting carbohydrates they thrive on, they stimulate the release of dopamine in the brain. This hijacking trains our reward system to crave more of the same foods, driving overconsumption.
A massive percentage of the metabolites—tiny chemical messengers—circulating in our blood are actually manufactured by our gut bacteria. These chemicals cross from the large intestine into the bloodstream and travel throughout the body. When we cultivate beneficial microbes, they pump out healing, anti-inflammatory compounds. But when opportunistic microbes take over, their chemical byproducts can trigger systemic inflammation, joint pain, or brain fog. It is a constant chemical dialogue, and our daily choices determine which messages get sent.
Hover over or tap the Brain, the Gut, or the nerve lines to explore how they communicate.
Model how your choices affect your biome by making adjustments on the left — the results show up on the right.
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Apply the principles of this field guide across our companion micro-utilities:
Log weekly botanical intake to cultivate substrate polycultures (30+ species target).
Track 30 Plants →Align your fasting window with how your body cleans your digestive system.
Track the best digestive window →Clinical protocols for rewilding gut soil following antibiotic shocks and acute dysbiosis.
Rewilding Portal ↗Listen to the companion podcast exploring the philosophical and practical intersections of our microbial selves.
Listen to Podcast ↗fallow.garden is an independent anthology of single-purpose micro-utilities created to counter cognitive fatigue, algorithmic noise, and relentless optimization culture. Each tool runs entirely on your device with zero tracking or account friction.
The concepts in this primer are deeply indebted to Emeran Mayer's The Mind-Gut Connection, Giulia Enders' Gut: The Inside Story of Our Body's Most Underrated Organ, and Ed Yong's I Contain Multitudes: The Microbes Within Us and a Grander View of Life.
Have ideas for new restorative modules, suggestions for current tools, or questions about the underlying research? Feedback and contributions are always deeply appreciated.