Kick off your book project in 3 hours! Live workshop on Zoom. You’ll leave with a real book project, progress on your first chapter, and a clear plan to keep going. Saturday, May 16, 2026. Learn more…

Leanpub Header

Skip to main content
Go to Leanpub.com

Qi: The Neuroscience, Chemistry, and Microbiology of Tea Meditation

Volodymyr Pavlyshyn

Qi — Teaser

There is a moment that happens reliably around the fifth small infusion of a well-stored aged sheng pu'erh. Your shoulders drop. Your jaw unclenches. The internal weather of the morning settles into something quieter. You are not drowsy. You are not "buzzed." You are present in a particular way that coffee has never produced.

The folk vocabulary calls this cha qi (茶氣) — "tea energy."

This book takes that subjective report seriously enough to take it apart.

What if Qi is real — and measurable?

Most books about tea pick a side.

They are either romantic — the kettle, the clay, the lineage, the master — and leave the science out.

Or they are reductionist — caffeine in milligrams, antioxidants in ORAC units — and leave the experience out.

Neither is honest.

Qi does the harder thing: it keeps the felt experience and explains it, citation by citation, without flinching.

Inside the cup, you will find:

  • Dopamine prediction errors firing on every small infusion — why Gongfu Cha is structurally well-fitted to how attention actually works.
  • L-theanine + caffeine as a two-molecule attention circuit, with EEG data to prove it.
  • Theabrownins — the dark, oxidised pseudo-fiber in aged Pu'erh — feeding the gut bacteria that upregulate TPH1, the enzyme that makes ~90% of your body's serotonin.
  • Eurotium cristatum — the "golden flower" fungus crawling through baskets of Fu Cha and Liu Bao, and what it does to your vagus nerve.
  • Water — 98–99% of the cup by mass, and the variable nobody optimises.
  • Sheng, Shu, Liu Bao, Fu Cha, Anhua — five different microbial assemblages, five different molecular fingerprints, five different physiological modes. Not interchangeable.
  • The ceremony cultures of China, Japan, and Korea — treated as historical objects with dates, not timeless mysticism.
  • The recursive cup — why a retuned drinker pulls more out of the next infusion than the last.

A nerd's field guide

30 short chapters. Each one built around a small number of testable claims. Every claim traceable to a peer-reviewed paper, mostly indexed in PubMed/PMC. Every metaphor paired with a mechanism. Every "Qi" sensation matched, where the literature allows, to a specific molecule or neural circuit.

Where the literature does not yet allow it, the book says so — plainly — instead of papering the gap with mysticism.

The opinionated thesis

  • Attention is the active ingredient. Not the chemistry.
  • The gut is doing more for your mood than your prefrontal cortex.
  • The nicest thing you can do for your brain in the morning is small cups of old leaves and silence.

If that sounds like your kind of nerdy — read on.

The cup is a small machine. This book is its manual.

Minimum price

$19.00

$29.00

You pay

$29.00

Author earns

$23.20
$
You can also buy this book with 1 book credit. Get book credits with a Reader Membership or an Organization Membership for your team.
PDF
EPUB
WEB
About

About

About the Book

 A Nerd's Field Guide to Kung Fu Cha, Pu'erh Fermentation, and the Recursive Co-Creation of the Cup

What this book is

Qi is a peer-reviewed walking tour of what actually happens when an attentive nervous system meets a small cup of old leaves.

It treats cha qi — the felt "tea energy" reported by Gongfu Cha drinkers for a thousand years — not as mysticism and not as placebo, but as a physiological event that can be decomposed into measurable parts: dopamine prediction errors, alpha-band EEG, vagal afferents, short-chain fatty acids, anthraquinone metabolites, gallic acid, theabrownins, and the small army of fungi and bacteria that turn raw leaf into something the brain reads as medicine.

Every claim is traceable to a peer-reviewed paper, mostly indexed in PubMed/PMC. Every metaphor is paired with a mechanism. Where the literature does not yet support a claim, the book says so plainly.

Who it is for

  • Tea drinkers who want to know why the fifth infusion of an aged sheng feels the way it does — and want a real answer, not a poetic one.
  • Scientists, clinicians, and biohackers curious about gut–brain signalling, polyphenol pharmacology, fermentation microbiology, and the EEG signature of attentional states.
  • Meditators and contemplatives looking for an honest bridge between traditional practice and modern neuroscience.
  • Anyone tired of choosing between the romantic tea book (kettle, clay, lineage) and the reductionist tea book (milligrams of caffeine, ORAC units). This one keeps both.

Structure

Seven parts, thirty short chapters:

  1. Neuroscience of Kung Fu Cha — prediction error, dopamine, exteroceptive grounding, alpha waves, the three-channel model of tea state.
  2. Chemistry & Biochemistry — L-theanine, caffeine, polyphenols, catechins, tannins, GABA, volatile aromatics and aging.
  3. Microbiome & Gut–Brain — the Sheng/Shu split, theabrownins as pseudofiber, SCFAs, TPH1, the vagal relay, and the recursive microbiome.
  4. Fermentation Atlas — Sheng Pu'erh, Shu Pu'erh and wodui pile fermentation, Liu Bao with Eurotium, Hei Cha, Fu Cha, Anhua.
  5. Water — why 95–99% of the cup is the variable nobody optimises; TDS, mineral chemistry, purification, and how to build brewing water.
  6. Ceremony Cultures — China (Lu Yu, Gongfu), Japan (Eisai, Rikyū), Korea (Darye, Cho-ui), treated as historical objects with dates.
  7. Recursive Co-Creation — the drinker as bioreactor, attention as the active ingredient, daily practice.

Plus references, glossary, and further reading.

How it was made

The book grew out of several years of essays the author wrote on Chainka and elsewhere — tasting notes that became research notes that became something book-shaped. It cites primary literature where it exists, animal models where it must, and traditional sources for everything they actually documented well (which is more than the reductionist literature gives them credit for).

It is draft v0.1 — argument-complete and citation-complete, still being polished and figured.

About the Author

Volodymyr Pavlyshyn writes at the intersection of neuroscience, microbiology, identity systems, and tea. Berlin-based. Long-time Gongfu Cha practitioner with a particular obsession for aged Sheng Pu'erh, Liu Bao, and the microbiology of post-fermented teas. He publishes ongoing tasting notes and research essays at Chainka, and writes more broadly on decentralized identity, agentic systems, and the architecture of attention.

This is his first long-form book on tea — and the one he wishes had existed when he started.

The cup is a small machine. This book is its manual.

Share this book

Feedback

Email the Author

Author

About the Author

Volodymyr Pavlyshyn

Hey I am Volodymyr 

Seasoned Developer's Journey from COBOL to Web 3.0, SSI, Privacy First Edge AI, and Beyond

 As a seasoned developer with over 20 years of experience, I have worked with various programming languages, including some that are considered "dead," such as COBOL and Smalltalk. However, my passion for innovation and embracing cutting-edge technology has led me to focus on the emerging fields of Web 5.0, Self-Sovereign Identity (SSI),AI Agents, Knowledge Graphs, Agentiic memory systems, and the architecture of a decentralized world that empowers data democratization.

A firm believer in the potential of agent systems and the concept of a "soft" internet, I am dedicated to exploring and promoting these transformative ideas. In addition to writing, I also enjoy sharing my knowledge and insights through videoblogging. Most of my Medium posts serve as supplementary content to the videos on my YouTube channel, which you can explore here: https://www.youtube.com/c/VolodymyrPavlyshyn. 

Join me on this exciting journey as we delve into the future of technology and the possibilities it holds.

Contents

Table of Contents

Qi

  1. The Neuroscience, Chemistry, and Microbiology of Tea Meditation

Preface

Introduction: A Map of the Cup

  1. What this book argues
  2. How to read this book
  3. What this book is not
  4. Chapter summary

Part I — The Neuroscience of Kung Fu Cha Meditation

Chapter 1 — What Qi Actually Is (and Isn’t)

  1. The folk definition
  2. The reductionist dismissal — and why it is wrong
  3. The mystical inflation — and why that is also wrong
  4. What Qi is, mechanically
  5. What Qi is not
  6. Key references for this chapter
  7. Chapter summary

Chapter 2 — Prediction Error, Dopamine, and the Small-Cup Engine

  1. The two-component dopamine response
  2. What this gives you, in practice
  3. Habituation is the catch
  4. The aesthetic of micro-novelty
  5. Caveat: prediction error is not pleasure
  6. Key references for this chapter
  7. Chapter summary

Chapter 3 — Wanting, Liking, and the Consummatory Phase

  1. The two systems
  2. The pleasure cycle
  3. Gongfu deliberately stretches the consummatory phase
  4. Why the substance matters less than the protocol
  5. The reverse-engineering insight
  6. Key references for this chapter
  7. Chapter summary

Chapter 4 — Sensory Expertise as Adult Plasticity

  1. What sommelier brains look like
  2. This is adult plasticity, not innate talent
  3. What this means for the dopamine engine
  4. The training protocol implied by the science
  5. The aesthetic implication
  6. Key references for this chapter
  7. Chapter summary

Chapter 5 — Exteroceptive vs Interoceptive Grounding

  1. What the literature says about adverse effects of interoceptive practice
  2. What exteroceptive grounding does, mechanically
  3. The MBSR raisin exercise — and why Gongfu is the same idea, scaled up
  4. Why this matters for the chronic-pain reader
  5. The synthesis
  6. Key references for this chapter
  7. Chapter summary

Chapter 6 — Alpha Waves and the Calm-Alert State

  1. What alpha is
  2. What L-theanine does to alpha
  3. What the brewing ritual does to alpha — the under-studied half
  4. Why alpha is what calm focus actually feels like
  5. The clinical reach
  6. Key references for this chapter
  7. Chapter summary

Part II — Tea Chemistry and Biochemistry

Chapter 7 — The Three-Channel Model

  1. The three channels
  2. Why “three channels” and not “one big channel”
  3. The convergence
  4. The honesty section
  5. Key references for this chapter
  6. Chapter summary

Chapter 8 — L-Theanine + Caffeine: The Calm-Alert Channel

  1. What L-theanine is
  2. What L-theanine does at the receptor level
  3. What caffeine does
  4. Why the combination produces a state neither alone produces
  5. The data
  6. The dose problem
  7. The Payne et al. caveat
  8. What this means for practice
  9. Key references for this chapter
  10. Chapter summary

Chapter 9 — Catechins, Tannins, and the Polyphenol Family

  1. The polyphenol family in tea
  2. What catechins do
  3. Tannins: condensed vs hydrolysed
  4. Why aging changes everything
  5. Why this affects your gut, not just your mouth
  6. The astringency lesson
  7. Key references for this chapter
  8. Chapter summary

Chapter 10 — GABA Tea: The Intestinal Route to Calm

  1. The blood-brain barrier objection
  2. Pathway 1: enteric GABA receptors
  3. Pathway 2: vagal relay (the load-bearing pathway)
  4. Pathway 3: EGCG’s parallel route
  5. What the clinical data show
  6. Why GABA tea feels different from L-theanine
  7. Practical notes
  8. Key references for this chapter
  9. Chapter summary

Chapter 11 — Volatile Aromatics and the Aged-Aroma Pathway

  1. Why aroma matters more than taste, neurologically
  2. What young Sheng smells of
  3. The transition middle phase (5–10 years)
  4. The aged-aroma compounds
  5. The catechin → gallic acid → pyrogallol → methoxybenzene cascade
  6. Storage conditions and the aroma fork
  7. The neurological coupling
  8. What this means for the felt experience
  9. Key references for this chapter
  10. Chapter summary

Part III — Pu’erh, Fermentation, and the Gut–Brain Axis

Chapter 12 — The Microbiology of Sheng vs Shu: Two Different Fermentation Logics

  1. The shared substrate
  2. The Sheng path: slow, atmospheric, time-driven
  3. The Shu path: fast, controlled, microbe-driven
  4. The microbial communities differ
  5. Why the felt difference between Sheng and Shu is real, not aesthetic
  6. The cha qi difference
  7. The practical guide
  8. Key references for this chapter
  9. Chapter summary

Chapter 13 — Theabrownins as Functional Pseudo-Fiber

  1. What theabrownins are
  2. Why “pseudo-fiber” is the right metaphor
  3. The metabolic angle
  4. The cardiovascular layer
  5. The neuroprotective layer
  6. The aged Sheng / Shu / Liu Bao comparison
  7. Why this matters for the felt experience
  8. Key references for this chapter
  9. Chapter summary

Chapter 14 — SCFAs, TPH1, and the Vagal Relay

  1. The setup: 90% of your serotonin is in your gut
  2. Step 1: Theabrownins reach the colon intact
  3. Step 2: SCFA-producing bacteria ferment them
  4. Step 3: Butyrate upregulates TPH1 via HDAC inhibition
  5. Step 4: Tryptophan preservation via reduced IDO
  6. Step 5: Vagal afferent activation
  7. Step 6: Behavioural and affective output
  8. The full chain on one page
  9. What this reframes
  10. Key references for this chapter
  11. Chapter summary

Chapter 15 — The Recursive Microbiome: How Daily Pu’erh Reshapes the Drinker

  1. The recursive principle
  2. What the studies show
  3. The compounding interest model
  4. Why this is also why daily practice matters
  5. The personalisation angle
  6. Recursive co-creation, in chemistry and in mind
  7. The skeptical reservation
  8. Key references for this chapter
  9. Chapter summary

Part IV — The Deep Fermentation Atlas: Sheng, Shu, Liu Bao, Hei Cha

Chapter 16 — Sheng Pu’erh: From Green Monster to Wise Elder

  1. What Sheng is
  2. Year 0–2: the Green Monster
  3. Year 5–10: the Awkward Adolescent
  4. Year 10–20: the Settled Adult
  5. Year 20–30+: the Wise Elder
  6. Storage matters as much as age
  7. The neurochemical journey, summarised
  8. How to read a Sheng cake
  9. Key references for this chapter
  10. Chapter summary

Chapter 17 — Shu Pu’erh: Wo Dui and Compressed Time

  1. The history
  2. The process
  3. The microbiology
  4. What Shu chemistry looks like
  5. The felt experience
  6. The pile-flavour problem
  7. Practical brewing
  8. Where Shu fits the practice
  9. Key references for this chapter
  10. Chapter summary

Chapter 18 — Liu Bao and the Anthraquinone Pharmacology of Eurotium cristatum

  1. What Liu Bao is
  2. The fungal biology
  3. What the anthraquinones do
  4. Liu Bao for spasticity: a personal case
  5. The Liu Bao felt signature, in three-channel terms
  6. Caffeine in Liu Bao: why it does not stimulate
  7. Brewing notes
  8. What “betel nut aroma” is
  9. Key references for this chapter
  10. Chapter summary

Chapter 19 — The Hypertone Collapse: Aged Liu Bao for Spasticity and Disability

  1. What spasticity actually is
  2. What “hypertone collapse” is
  3. The four-pathway explanation
  4. Why this combination does not exist in other teas
  5. The author’s protocol
  6. The honest reservations
  7. Why this chapter belongs in the book
  8. Key references for this chapter
  9. Chapter summary

Chapter 20 — The Hyperfocus Channel: Aged Dark Tea for the Synthesizer’s Secret Work

  1. What hyperfocus actually is (for this chapter’s purposes)
  2. What “the channel opens” feels like
  3. Why food interrupts it (and what to do about that)
  4. The four-pathway explanation
  5. Which leaf, for which kind of synthesis
  6. The author’s protocol for synthesizer sessions
  7. The honest reservations
  8. Why this chapter belongs in the book
  9. Key references for this chapter
  10. Chapter summary

Chapter 21 — Tea, Learning, and the Student Brain: How to Drink for Cognition

  1. The neurochemistry of learning, briefly
  2. Theanine: the substrate for sustained attention
  3. Caffeine: dose-response and the attention curve
  4. EGCG, BDNF, and the protein layer
  5. The microbiome layer for memory
  6. A protocol for the studying day
  7. The exam day
  8. Failure modes
  9. What this leaves out
  10. What this confirms
  11. Key references for this chapter
  12. Chapter summary

Chapter 22 — The Hei Cha Family: Fu Cha, Anhua, Tian Jian, and the Wider Hei Cha Map

  1. The Hei Cha geography
  2. Fu Cha: the golden flower brick
  3. Anhua Hei Cha and Tian Jian
  4. Sichuan brick (Tibetan trade tea)
  5. How to choose within Hei Cha
  6. The unifying biochemistry
  7. Key references for this chapter
  8. Chapter summary

Part V — Water Hacks: The Other 99% of the Cup

Chapter 23 — Why Water Is 98% of the Cup

  1. What is dissolved in water that matters
  2. Why minerals matter for extraction
  3. What “good water” tastes like in tea
  4. The lost variable in tea reviews
  5. The Lu Yu test
  6. Key references for this chapter
  7. Chapter summary

Chapter 24 — TDS, Mineral Profiles, and Brewing Chemistry

  1. The target water for tea
  2. Why these numbers
  3. Why magnesium, not calcium
  4. The acidity question
  5. The aged-Pu’erh edge case
  6. Quick test methods
  7. The “feels right” test
  8. Key references for this chapter
  9. Chapter summary

Chapter 25 — Purification Methods Compared

  1. 1. Activated carbon filtration (Brita-style)
  2. 2. Reverse osmosis (RO) + remineralisation
  3. 3. Bottled spring water
  4. 4. Mountain spring water (if you have access)
  5. 5. Distillation + remineralisation
  6. What to skip
  7. The Gongfu-grade recommendation
  8. Key references for this chapter
  9. Chapter summary

Chapter 26 — Building Your Own Brewing Water

  1. Recipe A: Universal tea water (start here)
  2. Recipe B: Aged Pu’erh / Hei Cha water
  3. Recipe C: Young Sheng / high-mountain oolong water
  4. On variations and tilts
  5. Equipment notes
  6. The boil
  7. A note on “live” water
  8. What this chapter does not teach
  9. Key references for this chapter
  10. Chapter summary

Part VI — Tea Ceremony Cultures: China, Japan, Korea

Chapter 27 — China: From Lu Yu to Gongfu Cha

  1. Tang: Lu Yu and the Monastery
  2. Song: whisked tea, emperors, and dark bowls
  3. Ming: 1391 and the great rupture
  4. Qing: the birth of Gongfu Cha
  5. What survived intact
  6. What the cup carries forward
  7. Key references for this chapter
  8. Chapter summary

Chapter 28 — Japan: Eisai, Rikyū, and the Crawl-In Door

  1. Murata Jukō and the seed of wabi
  2. Takeno Jōō and sabi
  3. Sen no Rikyū and the architecture of equality
  4. Hideyoshi, Kitano, and seppuku
  5. The Ido bowls — the strangest fact in Japanese tea
  6. Matcha and the chemistry of shade
  7. The unifying claim
  8. Key references for this chapter
  9. Chapter summary

Chapter 29 — Korea: Darye, Suppression, and Cho-ui Uisun

  1. The Buddhist period: Silla and Goryeo
  2. The Joseon rupture
  3. Cho-ui Uisun: the revival
  4. Jeong Yak-yong and the literati line
  5. What Korean tea culture looks like now
  6. What this teaches
  7. On the strange Korean–Japanese tea entanglement
  8. Key references for this chapter
  9. Chapter summary

Chapter 30 — Comparative Phenomenology of the Three Tea Cultures

  1. The matrix
  2. What each culture is for
  3. What each culture misses
  4. The synthetic practice
  5. What modern practice can add that none of the historical cultures had
  6. Key references for this chapter
  7. Chapter summary

Part VII — The Recursive Co-Creation: Drinker and Tea

Chapter 31 — The Drinker as Bioreactor: Recursive Co-Creation

  1. The claim
  2. The four recursions
  3. Why this is not mysticism
  4. Why this is also not reductionism
  5. The implication for the book’s argument
  6. The boundary case: someone who never sits with tea
  7. What the practitioner should do
  8. Key references for this chapter
  9. Chapter summary

Chapter 32 — Attention as the Active Ingredient

  1. The floor
  2. The ceiling
  3. Why the raisin works
  4. The empirical evidence for top-down attention as a physiological intervention
  5. The corollary: bad sessions are real
  6. What this implies for the practitioner
  7. The minimum viable practice
  8. The deepest implication
  9. Key references for this chapter
  10. Chapter summary

Chapter 33 — Tea as Replacement Ritual: Recovery, Habit Substitution, and the Addicted Brain

  1. Why a “replacement ritual” is the right concept
  2. The five-pathway explanation
  3. Which leaf, for which stage of recovery
  4. A protocol for the early-recovery reader
  5. The honest reservations
  6. Why this chapter belongs in the book
  7. Key references for this chapter
  8. Chapter summary

Chapter 34 — A Daily Practice

  1. The morning session (90 minutes, weekday)
  2. The afternoon recovery (30–40 minutes)
  3. The evening session (optional, 20–30 minutes)
  4. Weekly cadence
  5. What to track
  6. What to avoid
  7. What to expect across weeks
  8. The minimum non-negotiable
  9. The end
  10. Key references for this chapter
  11. Chapter summary

References

  1. Tea biochemistry — catechins, polyphenols, theanine
  2. Theabrownins, fermented teas, and microbiology
  3. Gut–brain axis, serotonin, GABA
  4. Neuroscience: dopamine, attention, plasticity
  5. Mindfulness, meditation, and exteroceptive grounding
  6. Caffeine pharmacology
  7. Brewing chemistry and water
  8. Tea cultural history (primary and secondary)

Glossary

  1. Tea & culture
  2. Chemistry & biology
  3. Practice vocabulary

Further Reading

  1. On the neuroscience of attention and reward
  2. On the gut–brain axis
  3. On meditation and contemplative neuroscience
  4. On tea history (China)
  5. On tea history (Japan)
  6. On tea history (Korea)
  7. On tea chemistry and the science of fermentation
  8. On water chemistry for brewing
  9. Practice and tasting
  10. On tea and culture (general)
  11. The author’s own articles
  12. A note for the next edition

The Leanpub 60 Day 100% Happiness Guarantee

Within 60 days of purchase you can get a 100% refund on any Leanpub purchase, in two clicks.

Now, this is technically risky for us, since you'll have the book or course files either way. But we're so confident in our products and services, and in our authors and readers, that we're happy to offer a full money back guarantee for everything we sell.

You can only find out how good something is by trying it, and because of our 100% money back guarantee there's literally no risk to do so!

So, there's no reason not to click the Add to Cart button, is there?

See full terms...

Earn $8 on a $10 Purchase, and $16 on a $20 Purchase

We pay 80% royalties on purchases of $7.99 or more, and 80% royalties minus a 50 cent flat fee on purchases between $0.99 and $7.98. You earn $8 on a $10 sale, and $16 on a $20 sale. So, if we sell 5000 non-refunded copies of your book for $20, you'll earn $80,000.

(Yes, some authors have already earned much more than that on Leanpub.)

In fact, authors have earned over $15 million writing, publishing and selling on Leanpub.

Learn more about writing on Leanpub

Free Updates. DRM Free.

If you buy a Leanpub book, you get free updates for as long as the author updates the book! Many authors use Leanpub to publish their books in-progress, while they are writing them. All readers get free updates, regardless of when they bought the book or how much they paid (including free).

Most Leanpub books are available in PDF (for computers) and EPUB (for phones, tablets and Kindle). The formats that a book includes are shown at the top right corner of this page.

Finally, Leanpub books don't have any DRM copy-protection nonsense, so you can easily read them on any supported device.

Learn more about Leanpub's ebook formats and where to read them

Write and Publish on Leanpub

You can use Leanpub to easily write, publish and sell in-progress and completed ebooks and online courses!

Leanpub is a powerful platform for serious authors, combining a simple, elegant writing and publishing workflow with a store focused on selling in-progress ebooks.

Leanpub is a magical typewriter for authors: just write in plain text, and to publish your ebook, just click a button. (Or, if you are producing your ebook your own way, you can even upload your own PDF and/or EPUB files and then publish with one click!) It really is that easy.

Learn more about writing on Leanpub