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Why Do We Get Fat? Part 2 - Insulin is the key

2025-12-01 Education
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Jason Fung
Jason Fung
1.4m subscribers

Debunking the Calorie Myth: Why Insulin Controls Weight Gain

Stop the cycle of failed dieting caused by misunderstanding weight regulation. Learn why lowering insulin, not simply restricting calories, is the key to sustained fat loss and controlling your body's internal weight thermostat.

Short Summary

  • Reject the flawed "Calories In, Calories Out" (CICO) model as the primary driver of weight gain.
  • Identify high long-term hunger and suppressed metabolism as direct consequences of CICO dieting strategies.
  • Pinpoint insulin as the central hormonal factor regulating body fat set points, storage, and release (lipolysis).

This discussion aggressively reframes obesity causality. It shifts focus from perceived personal choice (calories) to biological regulation (hormones, specifically insulin) that dictates hunger, satiety, and metabolic rate.

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Description

Pre-order The Hunger Code at www.doctorjasonfung.com. Check out hunger management tools at www.drinkaeira.com Stop counting calories. If 'Calories In, Calories Out' really worked, why do those diets fail 99% of the time? In this video, Dr. Jason Fung explains why obesity is not a caloric imbalance, but a hormonal imbalance—specifically involving insulin. Most people believe that weight gain is a personal choice caused by eating too much and exercising too little. But science tells a different story. Discover how your body's internal thermostat (BMR) actually regulates your weight and why lowering insulin, not calories, is the key to long-term fat loss. In this video you will learn: ● Why the 'Calories In, Calories Out' model is scientifically flawed. ● How damage to the hypothalamus leads to massive weight gain (independent of willpower). ● The role of Basal Metabolic Rate (BMR) in energy expenditure. ● How Insulin acts as a 'Fat Storage Hormone' and blocks lipolysis (fat burning). ● Why simply eating less lowers your metabolism and makes you regain weight. medical Disclaimer: The content of this video is for educational purposes only and is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. �� If you’re serious about losing weight without losing your health or youthful look, this video is a must-watch. �� Subscribe now for more science-backed videos on fasting, weight loss, an metabolic health. And don’t forget to like ��, comment ��, and share this vid with anyone who still believes in the calorie deficit myth! ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ ⏱️ Chapters / Timestamps 00:00 - The Big Lie: Why Do We Get Fat? 00:15 - The Energy Balance Equation Myth (CICO) 01:31 - BMR vs. Exercise: Where Calories Actually Go 02:41 - The Body Fat Thermostat: Lessons from Rat Studies 04:43 - Insulin is a Nutrient Sensor (Storage & Growth) 05:48 - Why High Insulin Blocks Fat Burning (Lipolysis) 06:24 - The Real Cause of Obesity: Hormones vs. Calories 08:00 - Why 'Eat Less, Move More'; Fails (Metabolic Adaptation) 09:15 - How to Fix Your Internal Weight Thermostat 10:11 - Conclusion: Insulin, Drugs, and The Obesity Code ============================= �� BOOKS: �� The Obesity Code - Reviewing underlying physiology of weight loss an how low carb diets and fasting can help. https://www.amazon.com/dp/1771641258?... �� The Diabetes Code - Reviewing how type 2 diabetes is a reversible disease and dietary strategies. https://www.amazon.com/dp/B0795BLS8D?... �� The Cancer Code - Scientific exploration of how cancer develops https://www.amazon.com/dp/0062894005?... �� Amazon: �� USA - https://www.amazon.com/shop/jasonfung �� Canada - https://www.amazon.ca/shop/jasonfung ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ �� Please visit our :- �� Website - https://www.doctorjasonfung.com �� Blog- / drjasonfung �� Community- https://www.thefastingmethod.com �� Facebook - / jason.fung.313 �� Instagram - / drjasonfung �� Twitter - / drjasonfung ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ �� YouTube Medical Lectures (for specialist physicians) ▶️ The Roots of the Obesity Epidemic: https: // • The Obesity Epidemic, Explained ▶️ Therapeutic Fasting - The Two Compartment Problem:https: // • Fasting and Weight Loss - Solving the... ▶️ Does Calorie Counting work?: • Why Calorie Counting rarely leads to ... ▶️ Two Big Lies of Type 2 Diabetes: • Two Big Lies about Type 2 Diabetes ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ If you liked the video, Please Do Subscribe My Channel ���� Keep Supporting me So I can Continue to provide you with free content each week!!�� ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ �� �� Thank you for Watching #DrJasonFung #TheObesityCode #WeightLoss #InsulinResistance #CaloriesInCaloriesOut #Metabolism #IntermittentFasting #LowCarb #HealthEducation

Top Comments (10)

@DrJasonFung 2025-12-01

Pre-order The Hunger Code at www.doctorjasonfung.com. Check out hunger management tools at www.drinkaeira.com

24 4 replies
@kostar500 2025-12-02

As a type 2 diabetic, nothing got me to lose fat more than OMAD and keto. Nothing. That shows how insulin resistance affects fat releasing ability, at least for me.

156 40 replies
@rachael780 2026-01-30

Dr. Fung is a national treasure.

7
@elizabethkjellbotn3469 2025-12-02

Thanks Dr. Fung! I have given up sugar, only eating non-processed food, and do timed interval eating - usually 16:8. I have also done a few 36 hour fasts. In under 3 months I have lost 35 pounds, and feel great.

50
@MdxRaz 2025-12-05

I'm a chef, and i swear I don't eat much. But what i do and have to do is taste 12 hours a day. And i have been doing that for more than 13 years. I have always only had max of 2 meals a day and even go to the gym. Although i have muscles my belly fat just wouldn't go away. Until i dissected every piece of details of what i put in my mouth and i realised that i was having to taste so much which meant theres so much excess intake of salt, sugar and fats. Once i eliminated that, i asked my colleagues to taste instead, i started fasting, and my belly fat disappeared within a month. I have a slim belly now after 2 months. Fasting works wonders. Thank you to all the wonderful Doctors that teach this. Incredible intelligent human being. Instead of prescriptions, they dug deep into root causes. Thank you !

40 6 replies
@Creative884_ 2025-12-01

This just works full stop. I'm 4 stones down in 7 months & totally reversed my Psoriasis which is why i started this journey. Eating the right foods & fasting is the best thing I've ever done. More energy, not hungry during fasting & i feel a million dollars. You can 100% eat yourself healthy & i have to thank my dermatologists for the great advice 👍

44 2 replies
@Learn_Edge1234 2025-12-04

I totally agree with Dr. Fung! It’s not just about calories. My journey with Dietornia has taught me how to eat right for my body type. I lost 15lbs in a month, and it feels incredible!

11
@janehex 2025-12-10

If this information ever gained mass appeal in the mainstream (as it so desperately should), the pharma industry would basically collapse. They have a crucial financial interest in discrediting this science. Always remember this when some doctor is telling you that fasting is "dangerous" or "a fad" or "an eating disorder". Then maybe ask them how they think insulin works.

7
@tinom96 2025-12-06

I'm so glad I found Dietornia! After watching videos like this, I customized my plan and lost 14lbs in 5 weeks. It's encouraging to see such real results!

12
@littlepixel1650 2025-12-29

I don’t know how you’re not even more popular. You are an amazing doctor.

2

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