Zhi Tsun, MD PhD, Harvard-Trained Psychiatrist — Burnout, Parts Work & Healing for High Performers

Show Notes

Dr. Zhi Tsun is a Harvard MD, MIT PhD integrative psychiatrist and longevity doctor for entrepreneurs and executives. He calls himself a "recovering academic" and "recovering serial entrepreneur" — during his MD/PhD he worked in the MIT lab that uncovered how rapamycin works, helping map the mTOR pathway now central to longevity, before leaving Harvard Medical School to build several companies.

In this episode, Zhi opens up about his own arc from academic to founder to rock bottom — burnout, anxiety, and depression — and what actually brought him back. He walks through parts work (Internal Family Systems), why most longevity protocols ignore emotional health, and how he now helps high performers get to the root cause in both mind and body.

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What You'll Learn

What mTOR actually is. The master pathway for growth and longevity — how rapamycin, fasting, and caloric restriction all work through it, explained without the jargon.

The anatomy of high-performer burnout. Zhi's own arc from academic to founder to rock bottom — how sleep, exercise, and connection quietly fall away, and why it's preventable.

Parts work, explained. Why we're made of parts — exiles that hold pain and protectors that keep us performing — and how understanding them gets to the root of emotional suffering.

The missing half of longevity. Why most protocols stop at the body — and why knowing and loving yourself is the piece no peptide or infusion can replace.

The basics beat the exotic. Why sleep, diet, and movement outperform fancy interventions — and why sleep may be the single highest-return lever for high performers.

Key Takeaways

mTOR is the master switch for growth and longevity. It sits downstream of the most famous longevity interventions — rapamycin, intermittent fasting, caloric restriction — and matters for cancer, diabetes, and how psychedelics reawaken the brain. Zhi helped map the pathway in the MIT lab that discovered how rapamycin works.

Burnout has a recognizable shape — and it's preventable. When things got hard, Zhi did the only thing he knew: work harder. Sleep went first, then exercise, then connection — until anxiety tipped into depression and a very dark place. His message to anyone who recognizes themselves: you're not alone, and highly effective help exists.

We are made of parts. Painful early experiences create "exile" parts that hold the hurt, and "protector" parts that keep us safe — the perfectionist who over-prepares, the striver chasing the next big thing, the firefighter that numbs. Naming them is the first step out of the internal tug-of-war.

You are the one who does the healing. Once the younger, wounded parts receive the love they never got, they relax. It doesn't depend on a therapist or a parent — love coming from yourself, toward your own parts, is the root-cause work.

Root cause runs two ways: mind and body. Zhi runs the same comprehensive panel he uses for longevity, because a hormonal deficiency turns inner work into an uphill battle. And longevity's real blind spot is emotional health — in the age of AI, knowing and loving yourself is the enduring skill no peptide can replace.

"You don't need peptides, you just need to be with yourself."

"Love coming from yourself, loving your parts, and being fully integrated — that's when people feel fully alive in a way that's durable and authentic."

"I feel space. There's a lightness, there's clarity. My heart really feels open — connected to myself and to my loved ones. That's my peak."

Episode Chapters

03:00Three 'Recovering' Chapters: Academic, Entrepreneur, Now Psychiatrist▾

Introduces himself as a 'recovering academic,' a 'recovering serial entrepreneur,' and someone now practicing as an integrative psychiatrist and longevity doctor — three distinct chapters he's moved through.
Frames the shift as deliberately refocusing on what matters most to him as a complete human being, which right now means family.
Sets up the arc the rest of the episode follows: research lab, startup founder, breakdown, and the practice he built out of what he learned recovering from it.

04:25Discovering mTOR — The Pathway Behind Rapamycin and Longevity Science▾

Was fortunate enough to work in the MIT lab that discovered how rapamycin — the most-studied longevity drug, shown to extend lifespan from yeast to mammals — actually works.
Helped identify components of the pathway it targets, mTOR (mechanistic target of rapamycin), now understood as a master switch for growth, cancer, diabetes, and longevity.
Notes that popular longevity interventions like intermittent fasting and caloric restriction all work through the same mTOR pathway — as does the synaptic 'awakening' produced by ketamine and psychedelics.

08:03Leaving Harvard for a Friend's Diagnostics Breakthrough▾

His lab sat across the street from the MIT Entrepreneurship Center — proximity that pulled him toward translating research into real-world impact rather than just publishing papers.
The leap came when his best friend, a fellow academic, developed an ultrasensitive diagnostics technology that could detect the moment sperm meets egg and other exceedingly rare biological events; neither of them knew the first thing about starting a company.
Left Harvard Medical School on unpaid leave — no salary, no health insurance — to co-found the startup; an early believer showed him academia wasn't the only path to real impact.

09:48A 'Never Good Enough' Upbringing — and the Burnout It Fueled▾

His father escaped Myanmar's military government to study in Canada; his mother, who had polio, left Hong Kong on an academic scholarship — both instilled a belief that hard work was the price of the life they'd sacrificed for.
His father's constant corrections — never overtly cruel, but relentless — left him internalizing that he wasn't good enough just for being, and had to perform to earn love and respect.
When his first company hit real difficulty, he did 'what I knew best' — worked harder. Sleep went first, then exercise, until anxiety narrowed into tunnel vision and he hid the struggle from his co-founders, his wife, and his parents.
Recalls driving home and thinking about crashing the car — the moment that pushed him onto medical leave, followed by a deep depression and a difficult search for the right psychiatric help; it took a sixth provider to find one who understood how to treat a high-functioning patient without blunting his cognition.

19:01Why Emotions Weren't Allowed Growing Up▾

Growing up in an Asian immigrant household, anger and shame were the only emotions openly expressed — and even those were never discussed, so he learned early that his emotions weren't acceptable.
His parents fought unpredictably; not knowing what he'd walk into taught him he had to be fully self-reliant, seeding the 'push harder' pattern he later had to unlearn as an adult.
Now works from the belief that suffering has both psychological and biological roots — hormones and body chemistry shape mood and cognition just as much as unresolved emotional wounds shape the body.

23:40Creating Space — Why Stepping Back Unlocks Clarity▾

Co-host Sophie shares how deeply Zhi's story resonated with her own experience with her fiancé — not having space for emotions as a child, followed by feeling 'not good enough,' as one of the biggest drivers behind people giving '170 percent' for years just to be seen and praised.
Both agree that safety and space are where genuine creativity and full self-expression come from — the opposite of the contracted, can't-express state that overachieving often masks.
Zhi ties it back to a core belief: our full, wise self already knows the answers — creativity and clarity return the moment the 'parts' of us driving relentless performance step back.

26:43Parts Work: The Internal Family Systems Framework That Changed Everything▾

Calls this 'the one takeaway' of the conversation: we're made of parts formed around painful early experiences — 'exile' parts that hold the pain, and 'protector' parts that guard against feeling it again.
Distinguishes proactive protectors (like his own perfectionism — over-preparing past the point of diminishing returns) from reactive 'firefighter' protectors (numbing through substances, scrolling, or other addictive behavior).
His own example: a lonely, powerless part of him as a child gave rise to a fiercely independent protector — 'I can do anything, I don't need anyone else' — that shaped how he operated for years.

31:37Treating Founders and Executives: Where Suppressed Emotion Shows Up in the Body▾

Built the practice he wishes he'd had — for entrepreneurs and executives who, like him, delivered extraordinary results at the cost of their health and their families; he did the same thing most recently with his third company, traveling to launch markets while his wife and three kids waited at home.
Runs the same comprehensive biomarker panel he uses for longevity patients, because hormonal deficiencies and imbalances make both performance and inner emotional work an uphill battle.
Takes a conservative approach to medication — lowest effective dose, used as a bridge rather than a fix — because prescriptions alone don't resolve the underlying pattern.
On what actually does the healing: not the therapist, not the medication, but appreciating and reconnecting with your own protector parts so the wounded, younger parts can finally receive the love they didn't get growing up.

39:04The Missing Half of Longevity — and the Basics That Beat the Exotic▾

Most longevity doctors are trained purely in physical health — understandable as a starting point ('don't die'), but it leaves emotional health almost entirely out of standard protocols.
His pushback on peptide-chasing for mental health: 'You don't need peptides, you just need to be with yourself' — self-knowledge, he argues, is the one enduring skill AI can't replace.
The biggest longevity misconception: reaching for exotic interventions before nailing sleep, diet, and exercise — the basics that are hardest to do consistently but deliver the fastest, most reliable returns.
Closing question — how he feels at his peak: 'space... lightness... clarity,' heart open, connected to himself and the people he loves.

Disclaimers

Medical disclaimer. The information in this episode is for educational purposes only and is not medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional before making decisions about your health, including your mental health.

At a Glance

Harvard Medical School

PhD

MIT — helped map the mTOR pathway

Companies founded before choosing psychiatry

Mental health providers before one finally helped

Zhi's Approach to the Basics

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Sleep First

The highest-return lever — clarity, creativity, and cognition improve literally the next day

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Any Movement Counts

No need to optimize VO₂ max or zone two — any exercise already benefits body and mood

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Time With Yourself

Not peptides — presence. Getting to know your parts gives enduring, durable wellbeing

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Comprehensive Testing

The same panel he runs for longevity — catch imbalances so inner work isn't uphill

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Medication as a Bridge

A conservative approach — lowest effective dose, used to cross a gap, not mask the cause

Concepts & References

mTOR & Rapamycin

The mechanistic target of rapamycin — the master pathway for growth and longevity. Rapamycin extends lifespan from yeast to mammals; fasting and caloric restriction act through the same pathway.

Internal Family Systems (Parts Work)

A model developed over ~50 years: we're made of exiles that hold pain and protectors (managers and firefighters) that shield us. Naming and loving these parts is the route to root-cause healing.

Ketamine, Psychedelics & the Brain

The synaptic growth and "awakening" seen with ketamine and psychedelics runs through the mTOR pathway Zhi helped map — ketamine can lift depression rapidly, something he didn't know was available during his own darkest period.

Connect with Zhi

🌐zflourish.com↗ 🔗LinkedIn↗