Why do diets so often fail… is it discipline or biology?
Dr. Jason Fung is a physician, nephrologist, and one of the most influential voices challenging how we think about metabolism, obesity, and chronic disease. He is the bestselling author of The Obesity Code, The Diabetes Code, and his newest book, The Hunger Code. He joins Dr. Michael Gervais this week on Finding Mastery for a conversation that challenges some of the most deeply held assumptions about weight, health, and the human body.
Dr. Fung’s central argument is this: we’ve been asking the wrong question. Instead of asking why people eat too much, we should be asking why they’re so hungry in the first place. And the answer, he argues, lies upstream of calories, upstream of discipline, in the hormones, habits, and food environments that shape our hunger without us even realizing it.
The Science of Hunger
Dr. Fung breaks down three distinct types of hunger: homeostatic hunger, driven by hormones and biology; hedonic hunger, driven by pleasure and reward; and conditioned hunger, driven by environment and learned behavior. Ultra-processed foods, he explains, are uniquely dangerous because they’re designed to hijack all three at once, spiking insulin, triggering dopamine, and conditioning us to associate almost every environment with eating.
Insulin Is Key
At the center of the conversation is insulin, the hormone Dr. Fung calls the master switch of fat storage and release. He explains why different foods produce wildly different hormonal responses even when the calorie count is the same, why food order at a meal makes a measurable difference, and why intermittent fasting is one of the most effective ways to drive insulin down and let the body work the way it was designed to.
The conversation also covers the GLP-1 debate, what perimenopause does to appetite hormones, how to think about fasting across gender differences, and why walking after a meal can significantly reduce your insulin response.
Takeaways:
- Why “eat less, move more” fails to address the real cause of weight gain
- The three types of hunger and what each one actually requires
- How ultra-processed foods hijack biology, behavior, and environment simultaneously
- Why insulin, not calories, is the key variable in metabolic health
- How intermittent fasting works, who it’s for, and how to approach it well
- What perimenopause does to hunger hormones, and what to do about it
- Why food order at a meal can reduce your insulin spikes
Your hunger isn’t a character flaw. Learn what’s actually behind it.
“…if the problem is overeating, then you could think of the problem as over-hunger” – Dr. Jason Fung
Resources + Links
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