Equipment Reference
Jason Fung MD
The Obesity Code (Paperback)
Jason Fung’s insulin-centric case for time-restricted eating
The nephrologist’s 2016 book that made intermittent fasting a clinical-sounding protocol: obesity as a hormonal (insulin) problem, not a calories-in morality play. Still the default Amazon fasting book. Pair with our IF and Longo guides; ignore any implication that you should unsupervised-fast on diabetes meds.
Typical price: $14 – $22 USD
How It Works
Clinician-popular synthesis of insulin and fasting literature. Strongest against constant grazing and sugary drinks. Weaker where ‘calories don’t matter’ is overstated — energy balance still exists. Not medical advice for type 1 diabetes, pregnancy, or eating-disorder history.
Insulin Hypothesis
Frequent refined carbs keep insulin high; fat storage stays easy. Fasting drops insulin so stored fat can be used.
Time Restricted Eating
16:8 or longer fasts as the intervention, not a new shake. Longo’s FMD is the periodic alternative.
What to Eat When You Eat
Whole food, fewer snacks, less sugar. Not a license for fasting then pizza at 6pm every night.
What You'll Experience
Reading
1 weekMost readers skip breakfast for a week before they finish the history chapters.
Practice
Month 1Hunger adapts for many; others sleep worse or binge at the window. Stop if disordered patterns return.
Benefits
Simple Protocol
Moderate EvidenceA clock is cheaper than a meal-replacement brand.
Insulin Literacy
Moderate EvidenceUseful counterweight to ‘just eat less’ without explaining hunger hormones.
Risks & Considerations
Diabetes Medications
high riskFasting on insulin or sulfonylureas can cause dangerous lows. Clinician first.
Eating Disorders
high riskTime restriction is a poor fit if restriction is already the problem.
Community Reviews
Synthesized consensus from Reddit, forums, and expert sources.
Called life-changing by IF converts; dietitians argue it oversimplifies calories. The no-snack rule is the durable takeaway.
- ·Insulin first
- ·Skip snacks
- ·Clinician if medicated
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