Book Reviews
The Diabetes Code Summary and Review
★★★★☆ 4.5/5 — A clear, physiologically grounded case that Type 2 diabetes is a disease of insulin excess, not insulin deficiency, and…
Read Summary →Jason Fung, MD
"Toronto nephrologist and fasting expert who argues Type 2 diabetes is reversible, not just manageable."
Jason Fung, MD, is a Toronto-based nephrologist (kidney specialist) and one of the world's leading experts on intermittent fasting and low-carbohydrate diets for the treatment of Type 2 diabetes and obesity. After years of managing dialysis patients whose kidney failure was rooted in unchecked diabetes, Fung became convinced that standard care was treating symptoms rather than the disease itself. In 2010 he founded the Intensive Dietary Management (IDM) Program in Toronto, a clinic dedicated to reversing Type 2 diabetes and obesity through therapeutic fasting and dietary change rather than escalating medication. He is the author of the bestselling The Obesity Code and The Complete Guide to Fasting, and his work has influenced how thousands of clinicians and patients think about insulin, weight, and metabolic disease.
{"books_reviewed": 1, "years_active": "2016-present", "primary_focus": "Metabolic health, insulin resistance & therapeutic fasting"}
Books by Jason Fung, MD
Our in-depth summaries and reviews of his work
Key Ideas & Recurring Themes
Diabetes as an Overflow Problem
Fung reframes Type 2 diabetes as a disease of too much insulin, not too little — excess glucose and fat overflow into organs like the liver and pancreas.
The Twin Cycle Hypothesis
Roy Taylor's model showing fatty liver and fatty pancreas as two reinforcing, and reversible, cycles driving diabetes.
Personal Fat Threshold
Each person has a genetic ceiling for safely storing fat; once exceeded, fat overflows into organs and triggers disease.
Notable Quotes
"Type 2 diabetes is a disease of insulin excess, primarily. It is not a disease of insulin deficiency."— The Diabetes Code
"You cannot solve a problem of too much insulin by giving more insulin."— The Diabetes Code
Book Author Jason Fung, MD
The Diabetes Code Summary and Review
★★★★☆ 4.5/5 — A clear, physiologically grounded case that Type 2 diabetes is a disease of insulin excess, not insulin deficiency, and that it can often be reversed rather than merely managed. Best for: readers with (or at risk of)…