Everyone tells you what to do. Nobody walks every step alongside you to empower you.
Google, social media and ChatGPT will hand you a thousand answers. None of them will walk with you through the months where it actually gets done. That gap has a name, and closing it is the whole of my work.
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The Implementation Gap
Information was never the bottleneck. What remains is the gap between what you could know and what you actually do.
It is why someone can read about health for a decade and stay unwell. Why five years of a second language in school still leaves most people unable to hold a conversation. Why the cleverest person you know may still be broke, unfit, or unhappy.
No amount of information closes this gap. Only implementation does.
What a mentor is for
Four jobs. The fourth is the one most people never hear about.
A better destination
Most people are aiming at the wrong target. First, we find goals actually worth reaching, shaped around your life, culture and constraints.
A route map
You can run fast in the wrong direction and never arrive. The route matters more than the effort you pour into it.
Daily guidance
Small steps, measured and logged, with feedback and course correction as your life shifts. Not a plan handed over and abandoned.
Then redundancy
The aim is that you close the next gap, and the one after, without me. A mentor who keeps you dependent has failed.
Who is Puru?
I’m Dr Purnendu Nath — trained as an experimental physicist and engineer, qualified as an actuary and CFA charterholder, then 25+ years running quantitative strategies at hedge funds and advising billion-dollar pension funds. Also a certified personal trainer. Full credentials here.
I lost 30Â kg of my own body fat in my 40s and have kept it off into my 50s. Endurance athlete, practising hyperglot, recreational mathematician, published researcher across markets, public health and medicine, TEDx speaker.
I’ve published almost 200 articles here.
The thread running through every one of those is the same one: teaching.
Since 2013, I have been mentoring people of all ages and a wide range of backgrounds, living around the world. Each person comes with their personal history, a set of goals, constraints and cultural preferences. I work with each one very closely so that their empowerment and being able to operate without me after a few months becomes an outcome.
Balance is true mastery. Going extreme in one direction never was.
Puru and Finance  Published research  Testimonials
Two kinds of wealth
I can work with whatever goals you come with, along with many other outcomes that you might desire along the way.
Internal wealth
The real kind. How you look, how you feel, how you think.
External wealth
Money and the decisions that shape it.
I am not a medical doctor. I’ve used lifestyle to work with conditions including insulin resistance and Type‑2 diabetes, hypertension, dyslipidemia, arteriosclerosis, atherosclerosis, PCOS, infertility, oligospermia, IBS, IBD, ulcerative colitis, Hashimoto’s, hypothyroidism, lupus, psoriasis, leucoderma, asthma, anxiety and depression — in many cases with a reversal of ill-health and complete withdrawal of medication. I’ve also worked alongside mentees managing epilepsy, Alzheimer’s, Parkinson’s and some cancers.
And underneath all of it — wisdom
Knowledge you can download. Intelligence you were largely born with. Wisdom — knowing which goals are worth having, when not to act, how to judge a system you are standing inside of — is the one that actually drives a good life.
Wisdom is also something that schools, employers, governments, and often families rarely encourage. Every mentoring relationship here is quietly but actively aimed at it.
Does it work?
In their words, not mine.
Diagnosed with ulcerative colitis at 25 and told it was incurable. Nine months of mentoring later, off every medication.
Sanjana Bafna Shah · Lawyer
A doctor herself, on antihypertensives despite a low BMI. Medication-free within a year — then sent her own patients.
Dr Sukhpreet Patel · Fertility Consultant
Down from 92 kg to 67 kg. “I didn’t just achieve my goals — I learned to choose them wisely.”
Rahul Sukumaran · Banker
In the best shape of two decades — and now hearing “you look 10 years younger, what’s your secret?”
Asha Shah · Mother of two
Beyond health: career growth and financial management too. “He leads entirely by example.”
Shishir Srivastava · Army Veteran
“He taught me how to fish, rather than give me the fish.” Six years on, the learnings still hold.
Sushant Dash · Branding Expert
“One quickly gets adept at setting and following through on one’s goals independently.”
AJ · Architect, Author, Athlete
Read dozens more from around the world →
How it actually works
No sales call. Six steps, and one of them is you walking away to think.
From then on it’s daily. Guidance runs off a live log you keep for life; some communication is on WhatsApp. Whatever your starting point, I haven’t turned anyone away yet.
The gap won’t close on its own.
Whatever age you are, whatever shape you’re in, whatever you’ve already tried — and wherever in the world you are. Send your name on WhatsApp and describe your situation.
Puru The Guru 