| Title | The Diabetes Code: Prevent and Reverse Type 2 Diabetes Naturally |
| Author(s) | Dr. Jason Fung |
| Publisher | Greystone Books |
| Year | 2018 |
| Edition | 1st Edition |
| Language | English |
| Pages | 288 |
| ISBN | 978-1-77164-265-1 |
| Genre | Health & Fitness, Medical, Nonfiction |
| Series | Dr. Jason Fung Code, Book 3 |
| Size | 1.93 MB |
| Extension |
Summary
The Diabetes Code: Prevent and Reverse Type 2 Diabetes Naturally is one of the most thought-provoking health books of recent years, authored by Dr. Jason Fung, a world-renowned Canadian nephrologist and New York Times bestselling author. Published in April 2018 by Greystone Books, this work represents the third installment in the Dr. Jason Fung Code series and arrives as a bold, rigorously argued challenge to the medical establishment's approach to type 2 diabetes. Rather than accepting the conventional wisdom that type 2 diabetes is a chronic, lifelong condition that can only be managed — not cured — Dr. Fung makes the compelling case that this disease is not only preventable but fully reversible through targeted dietary and lifestyle changes. The book quickly became a landmark in the field of metabolic medicine and dietary science, praised by leading physicians and health advocates around the world.
At the core of the book lies a fundamentally different understanding of what causes type 2 diabetes. Dr. Fung argues that the disease is not primarily a disorder of blood sugar but of insulin resistance — a condition in which the body's cells stop responding effectively to the hormone insulin, driving blood glucose to dangerous levels. He demonstrates that the standard medical response, which involves prescribing insulin or blood-glucose-lowering drugs, actually worsens the underlying problem over time by increasing insulin levels further and promoting weight gain. Instead, Dr. Fung traces the root cause of insulin resistance to hyperinsulinemia — chronically elevated insulin levels driven largely by a diet rich in refined carbohydrates and sugar. Through clear explanations supported by medical research and clinical evidence, he shows how understanding this hormonal cycle is the key to unlocking lasting recovery from type 2 diabetes.
The book moves beyond diagnosis and theory to provide a clear, practical framework for action. Dr. Fung outlines how specific dietary strategies — particularly low-carbohydrate and low-sugar eating patterns — can dramatically reduce insulin levels and allow the body to restore normal glucose regulation. A central pillar of his approach is intermittent fasting, which he presents not as a fad but as a clinically validated, physiologically grounded strategy for rapidly lowering insulin and reversing insulin resistance. He provides readers with multiple fasting protocols, from shorter daily windows to extended multi-day fasts, tailored to different health situations and personal preferences. Practical charts, dietary guidelines, and illustrative clinical examples help readers translate these principles into sustainable everyday habits, making the book as actionable as it is informative.
The Diabetes Code is written for a wide audience, though it speaks most directly to the tens of millions of people living with type 2 diabetes or prediabetes who are searching for real, lasting answers beyond daily medication. It is equally valuable for family members supporting a loved one with the condition, as well as healthcare professionals — including general practitioners, dietitians, and endocrinologists — who wish to understand an evidence-based alternative paradigm. The writing is accessible and free from unnecessary medical jargon, making it suitable for readers without a scientific background, while still being substantive enough for clinically trained readers. Anyone concerned about metabolic health, weight management, or long-term disease prevention will find the content directly applicable to their situation.
Since its publication, The Diabetes Code has earned exceptional praise from the medical community and general readership alike, garnering a rating of 4.47 out of 5 stars across thousands of reviews on major platforms. Endorsed by prominent physicians including Dr. Mark Hyman and Dr. Steven R. Gundry, the book has contributed significantly to shifting public and professional conversation around diabetes care. It stands as a companion and logical extension to Dr. Fung's earlier bestseller, The Obesity Code, reinforcing his broader argument that insulin — not fat, not calories alone — is the central metabolic hormone that determines both weight and metabolic disease. For anyone ready to move beyond symptom management and address the root causes of type 2 diabetes, this book offers both the scientific grounding and the practical tools to do so.
Key Features
- Presents a scientifically grounded argument that type 2 diabetes is a reversible condition caused by chronic insulin resistance, not simply high blood sugar.
- Explains how conventional treatments relying on insulin injections and blood-glucose-lowering drugs can inadvertently worsen the underlying hormonal imbalance driving the disease.
- Introduces hyperinsulinemia — chronically elevated insulin — as the central mechanism behind type 2 diabetes and the key target for dietary intervention.
- Provides a detailed, evidence-based explanation of how a low-carbohydrate, low-sugar diet directly reduces insulin levels and restores metabolic health.
- Outlines multiple intermittent fasting protocols, ranging from short daily eating windows to extended multi-day fasts, with guidance on when each is appropriate.
- Includes practical dietary guidelines, meal planning principles, and illustrative charts that make the program easy to apply in daily life.
- Draws on peer-reviewed medical research, clinical studies, and the author's direct patient experience to support every major claim in the book.
- Addresses the relationship between type 2 diabetes and related conditions such as obesity, heart disease, and fatty liver disease within a unified metabolic framework.
- Explores the history of dietary guidelines and explains how decades of nutritional misinformation contributed to the global diabetes epidemic.
- Discusses the risks and limitations of relying on pharmaceutical management alone, empowering patients to engage more actively in their own care.
- Offers insight into how insulin resistance develops progressively over time, and why early dietary intervention is critical to preventing irreversible damage.
- Contextualizes intermittent fasting within a broader understanding of human evolutionary biology and how the modern diet disrupts ancient metabolic pathways.
- Includes clear guidance for readers who are already on medication, explaining how to approach the transition to dietary management safely and in collaboration with a physician.
About the Author
Dr. Jason Fung is a Canadian nephrologist (kidney specialist) born in 1973 in Toronto, Canada. He earned his medical degree from the University of Toronto, Faculty of Medicine, and subsequently completed his residency in internal medicine at the same institution before undertaking a fellowship in nephrology at the University of California, Los Angeles (UCLA). He is certified by both the Royal College of Physicians and Surgeons of Canada and the American Board of Internal Medicine in the fields of internal medicine and nephrology. His clinical career in kidney medicine gave him a front-row view of the devastating consequences of poorly managed type 2 diabetes, as a significant proportion of his patients suffered from diabetic nephropathy — kidney disease caused directly by uncontrolled blood sugar and insulin imbalance. This clinical reality became the catalyst for his lifelong commitment to finding and promoting effective, non-pharmaceutical solutions to metabolic disease.
Driven by his clinical observations, Dr. Fung began investigating the role of diet, insulin, and fasting in the development and reversal of type 2 diabetes. He co-founded the Intensive Dietary Management (IDM) program to provide patients with the education, support, and tools needed to lose weight and reverse metabolic disease through lifestyle changes rather than medication alone. He later co-founded The Fasting Method, a global program extending this mission through online resources, coaching, and community support. Often described as one of the physicians most responsible for popularizing intermittent fasting in the modern era, Dr. Fung has prescribed low-carbohydrate diets and fasting to thousands of patients with documented results including weight loss, diabetes reversal, and improved overall wellbeing. He also serves as a director of the nonprofit Public Health Collaboration and is a frequent keynote speaker at international conferences on metabolic health and nutrition science.
Dr. Fung is a prolific and highly successful author in the health and science space. In 2016, he published The Obesity Code — one of the first mainstream books to advocate intermittent fasting for weight loss — which went on to sell over two million copies worldwide. The Diabetes Code followed in 2018, cementing his reputation as a leading voice in dietary medicine. His subsequent works include The Complete Guide to Fasting (co-authored with Jimmy Moore), The PCOS Plan (co-authored with Nadia Brito Pateguana), The Cancer Code, Life in the Fasting Lane, and The Diabetes Code Cookbook. He is a New York Times bestselling author whose work has been translated into numerous languages and has influenced patients, physicians, and policymakers around the globe. Dr. Fung lives and practices in Toronto, Canada.
Related Books
- The Obesity Code: Unlocking the Secrets of Weight Loss — Dr. Jason Fung
- The Complete Guide to Fasting — Dr. Jason Fung & Jimmy Moore
- The Cancer Code: A Revolutionary New Understanding of a Medical Mystery — Dr. Jason Fung
- The End of Diabetes: The Eat to Live Plan to Prevent and Reverse Diabetes — Dr. Joel Fuhrman
- Dr. Bernstein's Diabetes Solution: The Complete Guide to Achieving Normal Blood Sugars — Dr. Richard K. Bernstein
- The Blood Sugar Solution: The UltraHealthy Program for Losing Weight, Preventing Disease — Dr. Mark Hyman
- Always Hungry? Conquer Cravings, Retrain Your Fat Cells, and Lose Weight Permanently — Dr. David Ludwig
- Bright Line Eating: The Science of Living Happy, Thin, and Free — Susan Peirce Thompson
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Frequently Asked Questions
Q : What is the central medical argument that Dr. Fung makes in The Diabetes Code?
R : Dr. Fung's central argument is that type 2 diabetes is not a chronic, irreversible condition but a metabolic disease rooted in chronic insulin resistance driven by hyperinsulinemia — persistently elevated insulin levels caused largely by high consumption of refined carbohydrates and sugars. He contends that conventional treatments, by adding more insulin to an already insulin-saturated system, make the hormonal imbalance worse over time. The only true path to reversal, he argues, is reducing insulin levels through strategic dietary change and intermittent fasting, allowing the body's cells to regain their natural sensitivity to insulin. This represents a fundamental paradigm shift away from symptom management toward addressing the root hormonal cause of the disease.
Q : Is The Diabetes Code based on peer-reviewed scientific evidence, or is it primarily anecdotal?
R : The book is grounded in a combination of peer-reviewed medical research, metabolic science, and clinical experience drawn from Dr. Fung's nephrology practice in Toronto. Throughout the text, Dr. Fung references and explains numerous clinical studies on insulin resistance, low-carbohydrate diets, and fasting, contextualizing them in language accessible to general readers. He also draws on his direct experience prescribing fasting protocols and low-carb diets to thousands of patients, documenting measurable outcomes including blood sugar normalization and weight loss. While the book is written for a popular audience rather than as an academic text, its arguments are substantially supported by scientific literature.
Q : How does The Diabetes Code differ from other books on diabetes management?
R : Most mainstream books on diabetes management focus on strategies for controlling blood sugar levels within the framework of a chronic, progressive disease — essentially teaching readers to coexist with diabetes rather than reverse it. The Diabetes Code stands apart by directly challenging the premise that the disease is irreversible and by identifying insulin resistance — not blood sugar itself — as the true pathological target. Unlike books that recommend modest dietary adjustments alongside medication, Dr. Fung proposes a more radical restructuring of diet and eating patterns, including intermittent fasting, as the primary therapeutic strategy. This places it closer to a root-cause medicine approach than to conventional disease management literature.
Q : Is intermittent fasting safe for people who are already taking diabetes medication?
R : Dr. Fung addresses this question directly in the book, acknowledging that people currently on diabetes medication — particularly insulin or sulfonylureas — face a real risk of hypoglycemia (low blood sugar) if they begin fasting without medical supervision and appropriate medication adjustments. He strongly recommends that readers who are on pharmaceutical treatment consult with their physician before making any significant dietary changes or initiating a fasting protocol. The book provides enough context for both patients and their doctors to understand the physiological rationale for medication reduction as dietary changes take effect, but it does not suggest that readers abandon prescribed treatments unilaterally. Medical supervision is consistently emphasized throughout.
Q : What fasting protocols does the book recommend, and how are they structured?
R : The book presents a range of intermittent fasting protocols adapted to different health situations and individual tolerances. These include shorter-window approaches such as the 16:8 method — eating within an 8-hour window and fasting for 16 hours — as well as the 5:2 method involving two restricted-calorie days per week, and more intensive extended fasting periods lasting 24 to 36 hours or more for those with greater insulin resistance. Dr. Fung explains the physiological rationale for each protocol, describing how fasting duration affects insulin levels, glycogen depletion, and the transition to fat-burning metabolism. Readers are guided to select a protocol matched to their current health status and are encouraged to progress gradually under medical oversight.
Q : Is The Diabetes Code relevant for people with prediabetes or those simply at risk?
R : Absolutely — Dr. Fung explicitly addresses the continuum of insulin resistance that spans from early prediabetes through full type 2 diabetes, and his recommendations are arguably most powerful when applied early in this progression. For individuals who have been told they have prediabetes, elevated fasting glucose, or borderline HbA1c levels, the dietary and fasting strategies outlined in the book offer a concrete, evidence-based path to halting and reversing the metabolic decline before a formal diabetes diagnosis is reached. The book helps readers understand that prediabetes is not a benign or inconsequential condition but an advanced stage of insulin resistance that warrants urgent lifestyle intervention. Acting early, according to Dr. Fung, dramatically increases the likelihood of full metabolic recovery.
Q : What is the Dr. Jason Fung Code book series, and where does The Diabetes Code fit within it?
R : The Dr. Jason Fung Code series is a collection of books by Dr. Fung published through Greystone Books, each addressing a distinct aspect of metabolic and chronic disease through the lens of dietary science and therapeutic fasting. The series began with The Obesity Code (2016), which introduced the insulin hypothesis of obesity and became an international bestseller. The Diabetes Code (2018) is the third book in the series and applies the same hormonal framework specifically to the prevention and reversal of type 2 diabetes. The series also includes companion volumes such as The Obesity Code Cookbook and The Diabetes Code Cookbook, making it one of the most comprehensive popular-science resources on insulin-driven metabolic disease available to general readers.
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