Mastering Diabetes

The Revolutionary Method to Reverse Insulin Resistance Permanently in Type 1, Type 1.5, Type 2, Prediabetes, and Gestational Diabetes

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Mastering Diabetes

The Revolutionary Method to Reverse Insulin Resistance Permanently in Type 1, Type 1.5, Type 2, Prediabetes, and Gestational Diabetes

Order your copy today!


The New York Times bestselling authors of Mastering Diabetes have also been featured in:

National Public Radio

The New York Times bestselling authors of Mastering Diabetes have also been featured in:

"We’re extremely excited to publish this book with Penguin Random House. It’s taken us more than 2 years to write it, and we've packed the book with more than 800 scientific references. As two guys living with type 1 diabetes, we understand the day-to-day challenges of diabetes. This science has transformed our lives and we're excited to get the knowledge into your hands. We hope this book transforms your health from the inside out."

Cyrus Khambatta, PhD and Robby Barbaro, MPH

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10 Things This Book Will Teach You

Mastering Diabetes is a revolutionary book that will teach you how to…

  1. 1
    Get your best A1c in the next 3 months and maintain it for years
  2. 2
    Reverse insulin resistance permanently and feel the best you’ve felt in years
  3. 3
    Eat more and weigh less for the rest of your life
  4. 4
    Lower your cholesterol, blood pressure and triglycerides using food as medicine
  5. 5
    Get full control of your blood glucose for the first time in years
  6. 6
    Avoid the long-term chronic disease risks of low-carbohydrate and ketogenic diets
  7. 7
    Eat carbohydrate-rich food and overcome nasty food cravings
  8. 8
    Make 30 delicious and satisfying recipes that meet (and exceed) your nutrition needs
  9. 9
    Easily implement intermittent fasting for increased insulin sensitivity
  10. 10
    Know exactly how to move your body for incredible blood glucose control

And much, much more...

Health Professionals Love the Mastering Diabetes Method


This powerful book will revolutionize the way you think about diabetes. Written by two guys with type 1 diabetes at the forefront of the diabetes revolution, Cyrus and Robby have created a roadmap to understand the physiology of insulin resistance and give you the tools to reverse it using powerful scientific evidence.

Michael Greger, MD, FACC

New York Times Bestselling Author of How Not to Die and How Not to Diet


Diabetes robs millions of people of both quality and quantity of life and the number afflicted has skyrocketed. We truly need a ‘war on diabetes’ to address and reverse the root causes and this book is that game plan. I have seen the results and will share this manual with all of my patients.

Joel Kahn, MD, FACC

Author of The Plant Based Solution


Mastering Diabetes is a landmark book that shows how common beliefs about carbohydrates and diabetes are exacerbating a tragic epidemic. The knowledge and advice on these pages will improve millions of lives and provide a clear scientific model that can end diabetes as we know it.

Brian Wendel

Founder and President of Forks Over Knives


When you are a type 2 diabetic, my message is don’t control it – instead, get rid of it. Mastering Diabetes is a masterpiece with critical information that every diabetic should know. Knowledge is power. Why be a diabetic when you can recover?

Joel Fuhrman, MD

New York Times Bestselling Author of The End of Diabetes


This book is the best book in the market on the topic of diabetes. What makes this book remarkable is that in writing about diabetes, Cyrus and Robby have laid down the foundations of nutrition, health and behavior through science and personal experience. We strongly recommend this book for anyone who would like to take control of their health, reverse diabetes and live a vibrant life.

Ayesha Sherzai, MD and Dean Sherzai, MD, PhD

Authors of The Alzheimer's Solution: A Breakthrough Program to Prevent and Reverse the Symptoms of Cognitive Decline at Every Age

Directors of the Alzheimer’s Prevention Program, Loma Linda University

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Let Us Tell You More About the Book...

In Mastering Diabetes, Cyrus Khambatta, PhD, and Robby Barbaro, MPH detail their revolutionary method to reverse insulin resistance (the root cause of blood glucose variability) by eating carbohydrate-rich foods, intermittent fasting, and daily movement. The Mastering Diabetes method decreases overall chronic disease risk and maximizes life expectancy for people living with all forms of diabetes, including type 1, type 1.5, type 2, prediabetes and gestational diabetes.


Grounded in cutting-edge science, Mastering Diabetes teaches you why the current medical guidelines to eat a low-carb, high-fat diet actually increases your chronic disease risk even though they may improve short-term blood glucose control. This book will teach you how to minimize your risk for diabetes complications including coronary artery disease, atherosclerosis, cancer, high cholesterol, high blood pressure, obesity, peripheral neuropathy, retinopathy, Alzheimer’s disease, chronic kidney disease, and fatty liver disease.


Cyrus Khambatta, PhD and Robby Barbaro, MPH are experts on insulin resistance and are both living with type 1 diabetes. They have helped thousands of people transform their diabetes health using their food as medicine. 

Mastering Diabetes will reshape the way you think about diabetes and give you powerful tools and strategies to transform your nutrition from the inside out – whether you are hoping to reverse insulin resistance, lose weight, gain energy, reduce or eliminate your medication use today and for many years in the future.

Health Professionals Love the Mastering Diabetes Method

“Cyrus and Robby have revolutionized the treatment of diabetes, and teach you how to actually decrease your dependence on medication and improve your health rather than using band-aid treatments that don’t work. This book is an absolute MUST READ for everyone with diabetes. If you are serious about learning the real science about diabetes, and how to apply an evidence-based approach to reverse your diabetes and/or improve your numbers, THIS IS THE RIGHT BOOK FOR YOU.”

Dr. Angie Sadeghi, MD Internist and Gastroenterologist

"Over half of Americans are diabetic or pre-diabetic at a cost of over $300 billion/year. Type 2 diabetes is often preventable and even reversible by making comprehensive lifestyle changes—and the only side-effects are good ones. This user-friendly book shows why and how.”

Dean Ornish, M,D. Founder & President, Preventive Medicine Research Institute Clinical Professor of Medicine University of California, San Francisco Author, “Undo It!”

“In the world of ultra-processed convenience foods, it’s a struggle for many people to eat naturally, especially for people at risk for all forms of diabetes. This book will not only teach you the fascinating biology of diabetes, it lays out a daringly simple approach to eating whole foods that‘s actually the most powerful form of medicine ever discovered. If you’re at risk or living with diabetes, read this book - it will completely change your view of diabetes and help you live with exceptional health for many years to come.”

John Mackey Co-Founder and CEO, Whole Foods Market

This is a very important, readable book concerning an illness that grips an increasing number of people. The fact that a whole food plant based diet has such remarkable effect on diabetes is consistent with a broad swathe of illness and disease. The authors, Cyrus Khambatta and Robby Barbaro, also are highly qualified.

T Colin Campbell PhD Jacob Gould Schurman Professor Emeritus of Nutritional Biochemistry Cornell University Co-author, The China Study (2005)

“A whole food, plant based diet is the secret to longevity on every continent in the world. Now, this amazing book teaches us you don’t have to wait until old-age to reap the benefits. The Mastering Diabetes method will help you reverse insulin resistance, lose weight, and feel fantastic. Highly recommended!”

Dan Buettner New York Times Bestselling Author of The Blue Zones Solution

“Cyrus and Robby’s work is methodically researched, brilliantly written, and substantiated by hundreds of scientific studies. Autoimmune diseases can be successfully treated with a plant- based diet. I see it every day in my work with inflammatory bowel disease patients, and now Cyrus and Robby have shown us the incredible results of eating this way to master all forms of diabetes.”

Robynne Chutkan, MD Author of The Microbiome Solution

“Cyrus Khambatta and Robby Barbaro have translated their encyclopedic knowledge of diabetes care and management into a vocabulary that all readers may grasp. Their skill makes diabetes vanish or become a manageable companion.”

Caldwell B. Esselstyn, Jr., MD Author of Prevent and Reverse Heart Disease

“If you are struggling with any type of diabetes, read this brilliant book. The treatment protocol provided challenges deeply rooted beliefs about diabetes. Just go with it. Be prepared to experience health and healing like you never thought possible. Share it widely.”

Brenda Davis Author of Kick Diabetes Essentials

The Mastering Diabetes program is a phenomenal resource for patients with all forms of diabetes, enabling patients to profoundly improve their health. If the Mastering Diabetes approach was applied to patients with diabetes worldwide, I believe we would see an epidemic of wellness.

Robert Ostfeld, MD, MSc, FACC Preventative Cardiology

“Mastering Diabetes is the most powerful treatment I can prescribe to help my patients prevent, treat and sometimes even reverse their diabetes. If you are at risk for or have diabetes, please read this book today; it may save your life.”

James Loomis, Jr., MD, MBA Medical Director, Barnard Medical Center

“Do you have diabetes or know anyone who does? If so, buy this book. It’s that simple. Dr Cyrus and Robby break down the science like never before, and provide a practical plan to change your life, backed by research and personal experience. Within these pages you will find incredible tips and advice to completely revolutionise your health. What could be more important than that?”


“We’re seeing more and more that a plant-based diet is the way to go for maximum health. But this book is a game-changer. Cyrus and Robby make a compelling case that a plant based, whole food diet is the key to reversing insulin resistance. That’s a message that is great for all of us and for the planet too. Love it!”

Kathy Freston New York Times bestselling author of Quantum Wellness

About the Authors


Cyrus Khambatta, PhD

Living with Type 1 Diabetes since 2002

Cyrus Khambatta, PhD earned a Bachelor of Science in Mechanical Engineering from Stanford University in 2003, then earned a PhD in Nutritional Biochemistry from the University of California at Berkeley in 2012. He is the co-author of many peer-reviewed scientific publications.

He is the co-founder of Mastering Diabetes and Amla Green, and is an internationally recognized nutrition and fitness coach who has been living with type 1 diabetes since 2002. He co-created the Mastering Diabetes Method to reverse insulin resistance in all forms of diabetes, and has helped more than 10,000 people improve their metabolic health using low-fat, plant-based, whole-food nutrition, intermittent fasting, and exercise.

He is the co-host of the annual Mastering Diabetes Online Summit, a featured speaker at the Plant-Based Nutrition and Healthcare Conference (PBNHC), the American College of Lifestyle Medicine Conference (ACLM), Plant Stock, the Torrance Memorial Medical Center, and has been featured on NPR, KQED, Forks Over Knives, Healthline, Fast Company, Diet Fiction, and the wildly popular podcasts Plant Proof and Nutrition Rounds. He is a co-author of the upcoming book Mastering Diabetes with Robby Barbaro, MPH.


Robby Barbaro, MPH

Living with Type 1 Diabetes since 2000

Robby Barbaro, MPH graduated from the University of Florida and is the cofounder of Mastering Diabetes and Amla Green. He worked at Forks Over Knives for six years before turning his attention in 2016 to coaching people with diabetes full time.

Robby was diagnosed with type 1 diabetes at the age of 12 and has been living this lifestyle since 2006. In that time, while eating pounds of fruit every day, his HbA1c value has never exceeded 6.4%, and his blood glucose has been stable and easy to manage.

He is the co-host of the annual Mastering Diabetes Online Summit, a featured speaker at VegFest LA, and has been featured on Forks Over Knives, Vice, Thrive Magazine, Diet Fiction, and the wildly popular podcasts Plant Proof and Nutrition Rounds, and is the author of the upcoming book Mastering Diabetes with Cyrus Khambatta, PhD.

Robby enjoys exercising every day, spending time with friends, and sharing his lifestyle on Facebook, Twitter and Instagram.

Praise for the Mastering Diabetes Book

“Cyrus and Robby have expertise that transcends beyond scientific evidence to include personal experience with diabetes and a passion to heal. Their book Mastering Diabetes outlines a nutrition and lifestyle prescription that can truly save your life! Don’t miss out on this important and transformative read.”

Matthew Lederman, MD and Alona Pulde, MD New York Times Bestselling authors of Forks Over Knives Plan and Co-Founders of Kinectin.com

“With the publication of this landmark book, Cyrus Khambatta and Robby Barbaro have established themselves as the standard bearers of an exciting new approach to diabetes care. In doing so, these masters of diabetes treatment offer an evidence-based solution to America’s diabetes epidemic as well as all of the associated chronic illnesses that threaten to swamp our nation’s healthcare system. If you have diabetes or just don’t want to get it, Mastering Diabetes is essential reading.”

Ron Weiss, MD

“As a physician I am under tremendous pressures and time constraints, so it is imperative that I have excellent resources at hand to refer my patients to. Mastering Diabetes is my go to resource for my diabetic patients. Robby and Cyrus have done a phenomenal job putting this book together so that everyone can benefit from their years of personal and coaching experience. I wish every physician knew as much about diabetes and could communicate it to their patients as well as Robby and Cyrus do.”

Laurie L. Marbas, MD, MBA

“Cyrus Khambatta and Robby Barbaro have written an elegant, educational manual that all diabetics should read. With their personal stories, they remind us that illness does not define us. They remind us that we CAN control our destiny. Robby and Cyrus outline tools in a practical, easy to use handbook and show us how to change. I will certainly have this on the shelves in my medical clinic.”

Monica Aggarwal, MD, FACC Associate Professor, Division of Cardiology, University of Florida Director of Integrative Cardiology and Prevention

“A disruptive and visionary approach to diabetes. Robby and Cyrus live every day with Type 1 diabetes. While many of their recommendations may at first appear counterintuitive, they demonstrate the effectiveness by managing blood glucose day to day. One can’t dismiss this significant point. When real life observations clash with one’s world view, it’s the world view that takes second place. This book will likely challenge many people’s world view and it’s long overdue.”

Ray Cronise Scientist and Author of The Healthspan Solution

“In my 30 plus years of nutrition and lifestyle study and experience I have yet to see as complete and thorough approach to mastering diabetes as are found in these pages. I unequivocally recommend this book and Cyrus and Robby’s proven program for taking people from fear to freedom and from disease to dynamic living!”

Jay Sutliffe, PhD, RD Professor of Nutrition & Foods Northern Arizona University

“In your hands you hold the simple solution to the growing pandemic of diabetes. This book cuts through all the noise and confusion, and explains with great clarity the basics of a whole-food plant-based diet and why it is essential for “mastering diabetes”, and provides step-by-step instructions for how to make this and other important lifestyle changes. Regardless of whether or not you have diabetes, I strongly recommend you read this book, follow the authors' advice, and prepare to achieve a level of optimal health you never thought possible!”

Anthony Lim, MD, JD Medical Director, The McDougall Program

“Two extraordinary voices in the methods to mastering diabetes, Cyrus and Robby have not only the knowledge and passion to share this important information, but they have wisdom from personal experience conquering their own health, too. Mastering Diabetes is a must-read for anyone who has been impacted by diabetes in any of its forms and needs direction on how to live your best life either by preventing, managing, or even reversing this diagnosis.”

Julieanna Hever, MS RD CPT Author of The Healthspan Solution and Plant-Based Nutrition (Idiot’s Guide)

"Advertisements for automobiles in the 1960’s used to say, ‘Ask the man who owns one’ – implying that first-hand experience lets the owner speak with authority. This adage applies not only to cars but to medical challenges, as well. Mastering Diabetes by Robby Barbaro and Dr. Cyrus Khambatta is written by two men with first-hand knowledge of this malady, as each was diagnosed with type 1 diabetes many years ago. In this practical, readable book, they share their simple, effective (and delicious!) strategies to help you develop a food and lifestyle plan that will empower you or your loved ones to master diabetes. I recommend this excellent book to my patients and can confidently recommend it to you, too."

Michael Klaper, MD Director, Moving Medicine Forward Initiative

“A must-have for anyone with diabetes! A great resource on how diet can affect the health of those with diabetes!”

Shivam Joshi, M.D. Clinical Assistant Professor, NYU School of Medicine

“Robby and Cyrus don’t just teach you how to master your diabetes, they teach you how to master your own health. The information in this book will not only help those who are diabetics, but anyone who wants to lose weight, feel great and be the master of their health destiny, easily and deliciously

Chef AJ Author of The Secrets To Ultimate Weight Loss

"Mastering Diabetes by Robby and Cyrus provides a comprehensive guide for people to follow in order to prevent and even reverse type 2 diabetes, along with a real promise of avoiding its complications, such as blindness, kidney failure, nerve damage, and premature death. Read this book if your goal is to treat the cause, and change your life.”

Craig McDougall, MD Assistant Professor of General Internal Medicine, Oregon Health & Science University

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