The Diabetes Code by Jason Fung Summary

The Diabetes Code by Dr. Jason Fung argues that type 2 diabetes is rooted in excessive sugar consumption and hyperinsulinemia, asserting the condition can be reversed through low-carb diets and intermittent fasting instead of medication. The book critiques conventional drug-focused treatments, advocating for dietary changes to reduce insulin resistance and stabilize blood sugar.

This book is ideal for individuals diagnosed with type 2 diabetes, prediabetes, or those seeking natural strategies to manage insulin resistance. It’s also valuable for healthcare professionals exploring alternative dietary approaches to diabetes care. Fung’s clear, evidence-based explanations cater to readers skeptical of pharmaceutical-dependent treatments.

Yes, for its actionable plan to reverse type 2 diabetes through diet and fasting, supported by medical research. However, its restrictive dietary recommendations (eliminating sugars, refined carbs, and grains) may challenge long-term adherence. Critics note it oversimplifies diabetes as solely caused by sugar, but it remains a compelling resource for non-drug solutions.

Fung advocates avoiding all added sugars, refined carbohydrates (bread, pasta, rice), and processed foods while increasing natural fats. He emphasizes whole foods like vegetables, nuts, and proteins, paired with intermittent fasting to lower insulin levels. Sample meal plans prioritize low-carb, high-fat meals to stabilize blood glucose.

Fasting periods reduce insulin production, allowing the body to burn stored fat and improve insulin sensitivity. By alternating eating windows with fasting (e.g., 16–24 hours), the body depletes glycogen reserves, lowering blood sugar and addressing hyperinsulinemia. Fung argues this approach treats the root cause, not just symptoms.

Critics argue the book oversimplifies diabetes as solely caused by sugar, ignoring genetic and lifestyle factors. Others question the sustainability of its strict diet, particularly the elimination of fruits and grains. Medical professionals caution against discontinuing medications without supervision, as Fung’s approach may not suit all patients.

Both books emphasize insulin’s role in metabolic disorders and promote intermittent fasting. While The Obesity Code focuses on weight loss through hormonal balance, The Diabetes Code targets reversing type 2 diabetes via similar mechanisms, with added meal plans and diabetes-specific research. Fung’s core message—reducing sugar and refined carbs—ties the two works together.

Fung cites studies and clinical cases where low-carb diets and fasting normalized blood sugar levels, enabling patients to reduce or eliminate medications. Success depends on strict adherence to dietary changes, which may reverse insulin resistance in motivated individuals. However, results vary, and maintenance requires lifelong lifestyle adjustments.

1. Hyperinsulinemia: Excess insulin drives fat storage and insulin resistance
2. Dietary sugar avoidance: Eliminate fructose and refined carbs to lower insulin
3. Intermittent fasting: Regular fasting windows restore metabolic flexibility
4. Whole foods: Prioritize unprocessed foods like vegetables, meats, and healthy fats

The diet requires significant lifestyle changes, such as avoiding common foods like bread and fruit. While meal plans provide structure, the rigidity may be unsustainable for some. Fung acknowledges the challenge but argues the health benefits outweigh short-term sacrifices. Support groups and gradual implementation improve adherence.