Jason Fung
Scientific videos on how to lose weight and reverse type 2 diabetes with diets and intermittent fasting.. Official channel of Dr. Jason Fung - specialist physician, nephrologist and New York Times best selling author of The Obesity Code, The Complete Guide to Fasting, The Diabetes Code and The Cancer Code. Dr. Fung has experience from treating thousands of patients over many decades and shares his insights on weight loss, diets, nutrition, type 2 diabetes reversal, and intermittent fasting. The success rate of basic weight loss advice of calorie counting has been shown to be abysmally low. To lose weight, don't follow strategies...
A Calorie Deficit cannot EVER exist – here’s why!
Most people are told that “weight loss = calorie deficit.” But the truth is, a calorie
deficit is a myth. Your body is not a simple calculator where you just subtract
calories and lose fat. In this video, Dr. Jason Fung explains the science behind
why focusing only on calories fails, and why hormones, insulin, and fat
metabolism are the real keys to healthy and lasting weight loss.
When people try extreme dieting or drug-induced appetite suppression, they
often experience side effects like the dreaded “Ozempic face” — hollow cheeks,
sagging skin, and an unhealthy...
Best Weight Loss Plans Reviewed (2021) | Jason Fung
Dr. Fung reviews the best diets for weight loss as ranked by Google search. The third most popular diet in 2020 was the Paleo diet. While there is good scientific evidence to support it, it has been steadily losing popularity and Dr. Jason Fung explains why. The second most popular diet of 2020 was intermittent fasting, an intervention gaining steady popularity and supported by Dr. Fung. The most popular diet by far in 2020 was the Keto Diet. Check out my blog at https://medium.com/@drjasonfung
More Information:
BOOKS:
The Obesity Code - Reviewing underlying physiology...
Complete Guide to Type 2 Diabetes Remission | The Diabetes Code Clinic (Part 1/6)
Are you struggling with Type 2 diabetes or know someone who is? In this first session of The Diabetes Code Clinic, renowned expert Dr. Jason Fung takes you on a comprehensive journey to understand Type 2 diabetes and the steps you can take to reverse it effectively.
Dr. Fung breaks down the science, myths, and proven methods behind reversing Type 2 diabetes naturally without relying solely on medications. Whether you're new to managing diabetes or looking for advanced insights, this video is your guide to a healthier future.
This is Part 1 of a 6 part series that is used...
Controlling the 'Body Fat Thermostat'
Are you struggling to lose weight despite eating less and exercising more? It’s time to stop blaming your willpower and start understanding your biology.
Dr. Jason Fung, best-selling author of The Obesity Code, explains the revolutionary concept of the "Body Fat Thermostat." Just like your home’s AC maintains a specific temperature, your body has a "set point" for how much fat it wants to carry.
If you only focus on "Calories In vs. Calories Out" without addressing your hormones, your body will fight back by increasing your hunger and slowing down your metabolism. This is w...
Why almost 80% of my patients are quietly quitting Ozempic
Are weight-loss drugs like Ozempic, Wegovy, and Tirzepatide truly miracle cures? In this in-depth video, Dr. Jason Fung breaks past the media hype to examine real-world data, including cohort studies from JAMA and Blue Cross Blue Shield (BHI), revealing a side of modern weight-loss treatments that few are talking about.
While clinical trials paint a glowing picture, real-world statistics tell a different story: a massive percentage of patients—ranging from 60% to nearly 80%—stop taking these medications within one to two years. But why are millions of people walking away from a drug that promised them results?
D...
Practical Fasting for Type 2 Diabetes - The Diabetes Code Clinic Part 5/6
Struggling with high blood sugar? In Part 5 of our series, Dr. Jason reveals how
intermittent fasting can be a powerful, natural, and free tool to put Type 2 diabetes
into remission.
Discover the science-backed method that, in a recent 2023 study, helped a stunning
47.2% of people get off their medication and normalize their blood sugar levels. If you
feel like your body is an overflowing barrel of sugar, this video will show you how to
open the drain.
➡️ Subscribe to the Channel for the Final Part!
[https://www.youtube.com/@DrJasonFung]
�� TIMESTAM...
A Conversation with Dr. Brian Lenzkes | Jason Fung
🌟 Welcome to the Fasting & Longevity Summit 2.0 Series! 🌟
A Conversation with Dr. Brian Lenzkes | Jason Fung
📢 Don’t Miss the Fasting & Longevity Summit 2.0!
Get exclusive access to interviews with top experts and game-changing fasting insights. Sign up for the Summit before it’s too late!
👉https://drtalks.com/summit/fasting-longevity?uid=828&oid=87&ref=3679
Join Dr. Jason Fung as he embarks on an extraordinary journey to uncover the transformative power of fasting and metabolic health! 🎥 In this exclusive series, Dr. Fung sits down with Dr. Brian Lenzkes, a San Diego-based physician passionate about reshaping the...
How to Eat and Fast around the Menstrual Cycle and Peri-Menopause.
Metabolic Insights from Lumen biometrics
Best Times to Fast During Your Menstrual Cycle & peri-Menopause | Dr. Jason Fung
Use this Coupon code for a special 10% promotion:
Coupon Code: DRFUNG
Link: https://www.lumen.me/?utm_source=sp-influencer&utm_medium=youtube&utm_id=sp1184&utm_banner=sp1184-yt-2025-05-31-1&utm_campaign=Dr._Jason_Fung&utm_term=2025-05-repeat&utm_content=mention&discount=drfung&inf_id=sp1184
Understanding how your body changes through the menstrual cycle i
key to smarter, more effective fasting. In this video, Dr. Jason Fung breaks
...
Weight Loss Plateau (7 Quick Strategies to Break Through) | Jason Fung
Struggling with a weight loss plateau? This can happen on any diet. Dr Jason Fung shares 7 strategies to break through the weight loss plateau. Check out my blog at https://medium.com/@drjasonfung
More Information:
BOOKS:
The Obesity Code - Reviewing underlying physiology of weight loss and how low carb diets and fasting can help. https://www.amazon.com/dp/1771641258?ref=exp_jasonfung_dp_vv_d
The Diabetes Code - Reviewing how type 2 diabetes is a reversible disease and dietary strategies. https://www.amazon.com/dp/B0795BLS8D?ref=exp_jasonfung...
Weight Loss Solution (Step by step) | Jason Fung
The weight loss solution from Dr. Jason Fung's book The Obesity Code in 5 easy steps. The first step is the reduce added sugars. Be careful of hidden sugars in processed foods and sauces. The second step is to reduce refined carbohydrates. These processed foods are easy to overeat. The third step is to eat moderate protein and don't fear dietary fat. The fourth step is to eat natural, unprocessed foods. These contain natural satiety signals that tell us when to stop eating. The fifth step in this weight loss solution is the do intermittent fasting. Check out my blog...
What causes Ozempic face and how to avoid it
Dr. Jason Fung reveals the science of facial fat loss, subcutaneous vs. visceral fat,
and how to lose weight without damaging your appearance.
Have you ever seen someone lose a lot of weight but end up looking tired, old, or
even sickly? You might’ve heard the term “Ozempic Face” — a phrase describing the
hollow cheeks, sunken eyes, and wrinkled skin people often get after rapid weight
loss through appetite-suppressing drugs or extreme calorie restriction.
But here's the good news: Fasting doesn’t cause Ozempic Face. In fact, it can protect
your facial app...
What is the Best Fast Length? (Fasting Basics 3) | Jason Fung
Dr Jason Fung discusses the best fast lengths for you, including 16;8, Time Restricted Eating, 24 hour fasts, One Meal a Day (OMAD), 5:2 diet, extended fasting and more. Shorter fasts are best done more often, but longer fasts (extended fasting) are more powerful. The best fast is the one that fits into your lifestyle. Fit your fasting into your lifestyle, don't fit your lifestyle into fasting. Check out my blog at https://medium.com/@drjasonfung
More Information:
BOOKS:
The Obesity Code - Reviewing underlying physiology of weight loss and how low carb diets and fasting can...
Diet and Disease (The Obesity Code Lecture part 5)
Exploring the link between diet and disease. How are diabetes, heart disease, stroke, obesity and cancer linked to our diet? Understanding this association leads to fascinating new treatment possibilities. Check out my blog at https://medium.com/@drjasonfung
More Information:
BOOKS:
The Obesity Code - Reviewing underlying physiology of weight loss and how low carb diets and fasting can help. https://www.amazon.com/dp/1771641258?ref=exp_jasonfung_dp_vv_d
The Diabetes Code - Reviewing how type 2 diabetes is a reversible disease and dietary strategies. https://www.amazon.com/dp/B0795...
Fasting and Weight Loss - Solving the Two-Compartment problem
Why intermittent Fasting is a simple solution for weight loss. Body fat is simply a method of storing food energy. When we eat, our body wants to store those calories. When we don't eat (intermittent fasting), our body uses those calories. So, if we want to lose body fat, increase the duration of time that we are not eating. Check out my blog at https://medium.com/@drjasonfung
More Information:
BOOKS:
The Obesity Code - Reviewing underlying physiology of weight loss and how low carb diets and fasting can help. https://www.amazon.com...
Type 2 Diabetes isn't Genetic ... It's Caused by THIS
Are you struggling to understand the real root cause of Type 2 Diabetes?
For decades, the medical community has focused on insulin resistance
without clearly explaining what actually causes the cells to become
resistant in the first place.
In this comprehensive masterclass, we break down the science of insulin
resistance and reveal why the outdated 'Lock and Key' (internal
starvation) theory fails to explain the modern obesity and diabetes
epidemics. Instead, we explore the 'Overflow Paradigm'.
You will discover how decades of high-carbohydrate diets have literally
overstuffed your cells with...
Intermittent Fasting for Type 2 Diabetes Reversal | The Diabetes Code Clinic (Part 4)
Welcome to The Diabetes Code Clinic (Part 4) with Dr. Jason Fung! This episode explores how intermittent fasting can effectively reverse type 2 diabetes by addressing the root cause—excess glucose in the body. Dr. Fung breaks down the science behind fasting, provides actionable steps to safely start fasting, and shares inspiring success stories of individuals achieving diabetes remission.
Whether you're newly diagnosed with type 2 diabetes or looking for a natural way to manage your blood sugar levels, this comprehensive guide will help you take charge of your health.
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Timestamps for Easy Navigation:
⏱️ 00:00 – Topics to Be Covered Today
⏱️ 00:27 – Intermittent Fasting
⏱️...
Reversing Insulin Resistance (The Obesity Code Lecture part 3)
Exploring the role of insulin resistance and diet. How hormonal obesity theory explains the epidemiology of obesity. Check out my blog at https://medium.com/@drjasonfung
More Information:
BOOKS:
The Obesity Code - Reviewing underlying physiology of weight loss and how low carb diets and fasting can help. https://www.amazon.com/dp/1771641258?ref=exp_jasonfung_dp_vv_d
The Diabetes Code - Reviewing how type 2 diabetes is a reversible disease and dietary strategies. https://www.amazon.com/dp/B0795BLS8D?ref=exp_jasonfung_dp_vv_d
The Cancer...
How to Reverse Type 2 Diabetes Naturally | Jason Fung
Reverse Type 2 Diabetes naturally, without medications. It is a curable disease, but as a dietary disease, it demands a dietary treatment. The principles including fasting and weight loss are outlined. Dietary modification is the cornerstone of reversing type 2 diabetes. Check out my blog at https://medium.com/@drjasonfung
More Information:
BOOKS:
The Obesity Code - Reviewing underlying physiology of weight loss and how low carb diets and fasting can help. https://www.amazon.com/dp/1771641258?ref=exp_jasonfung_dp_vv_d
The Diabetes Code - Reviewing how type 2 diabetes is a reversible...
Control HUNGER, not Calories
Preorder The Hunger Code and receive over $500 worth of free bonuses. Check https://www.doctorjasonfung.com/gift-with-purchase-offer
Why do so many people struggle with weight loss even when they carefully count calories?
In this video, Dr. Jason Fung explains a powerful shift in thinking: instead of obsessing over calories, we should focus on controlling hunger. Hunger is not a lack of willpower—it’s a hormonal signal, and when hormones are ignored, long-term weight loss becomes nearly impossible.
This discussion breaks down why traditional calorie-counting often fails and how hunger, insulin, and metabolism are deeply conn...
The Obesity Code Lecture (Why do we get Fat?) Part 1
Unlocking the code of why obesity became such a massive epidemic since the 1970s. A scientific exploration with a surprising conclusion of how obesity developed. Practical tips on weight management and good health. Why calorie counting fails for many people. Check out my blog at https://medium.com/@drjasonfung
More Information:
BOOKS:
The Obesity Code - Reviewing underlying physiology of weight loss and how low carb diets and fasting can help. https://www.amazon.com/dp/1771641258?ref=exp_jasonfung_dp_vv_d
The Diabetes Code - Reviewing how type 2 diabetes is a...
Hormones in Weight Loss (The Obesity Code Lecture part 2)
Insulin and cortisol are key hormones in weight loss. Our body gains or loses fat based on the hormonal instructions we give it. When insulin is high, we store fat. We discuss why the Atkins diet lost popularity for a time and why it rebounded in new forms. The role of the stress hormone cortisol in weight loss. Check out my blog at https://medium.com/@drjasonfung
More Information:
BOOKS:
The Obesity Code - Reviewing underlying physiology of weight loss and how low carb diets and fasting can help. https://www.amazon.com/dp/1771641258...
As good as Ozempic? Tools for Managing Hunger
Check out www.drinkaeira.com. I don't own any part of the company or get paid commission. Neither is this a sponsored video.
Most people believe that counting calories is the key to weight loss, but that is a major misconception. The real secret to lasting weight loss isn't about calories—it's about controlling hunger. Drugs like Ozempic and GLP-1 agonists have proven this by targeting appetite, but you don't need medication to achieve these results.
In this video, I break down the science of hunger management and share 3 powerful natural tools to help you suppress ap...
A Conversation with Dr. Tro Kalayjian | Jason Fung
📢 Don’t Miss the Fasting & Longevity Summit 2.0!
Get exclusive access to interviews with top experts and game-changing fasting insights. Sign up for the Summit before it’s too late!
👉https://drtalks.com/summit/fasting-longevity?uid=828&oid=87&ref=3679
Welcome to the Fasting and Longevity Summit 2.0, hosted by Dr. Jason Fung, a global leader in fasting and metabolic health. In this transformative episode, Dr. Fung sits down with Dr. Tro Kalayjian, a renowned obesity specialist and pioneer in metabolic syndrome management. Together, they share their personal journeys, professional insights, and strategies for overcoming obesity and achieving lasting he...
Fructose and Fasting (The Obesity Code Lecture 4)
Why fructose and sugar intake plays such a major role in weight gain and diabetes. Intermittent fasting is a great method of reversing insulin resistance and losing weight. Check out my blog at https://medium.com/@drjasonfung
More Information:
BOOKS:
The Obesity Code - Reviewing underlying physiology of weight loss and how low carb diets and fasting can help. https://www.amazon.com/dp/1771641258?ref=exp_jasonfung_dp_vv_d
The Diabetes Code - Reviewing how type 2 diabetes is a reversible disease and dietary strategies. https://www.amazon.com/dp/B0795BLS8...
A Conversation with Cynthia Thurlow | Jason Fung
🌟 Transform Your Health with Expert Insights 🌟
A Conversation with Cynthia Thurlow | Jason Fung
📢 Don’t Miss the Fasting & Longevity Summit 2.0!
Get exclusive access to interviews with top experts and game-changing fasting insights. Sign up for the Summit before it’s too late!
👉https://drtalks.com/summit/fasting-longevity?uid=828&oid=87&ref=3679
Join Dr. Jason Fung, renowned fasting and longevity expert, as he delves into groundbreaking discussions with some of the world’s most influential voices in health and wellness. This new series is designed to empower YOU with the knowledge to take control of yo...
LEAST Helpful Diet Advice | Jason Fung
Dr. Jason Fung reviews the conventional but least helpful diet advice to lose weight. This advice is repeated over and over by doctors, dieticians and magazines but are not useful. "Choose the Best Diet for You" or sometimes "The best diet is the one that you can stick to" is advice that just doesn't work. The second piece of bad diet advice is "Eat everything in Moderation". That doesn't work either. The worst piece of dietary advice? "Cut your Calories" or "Eat Less, Move More". While it sounds like it works, it has failed for decades and its success...
Insulin Blocks Fat Burning - The Key to Weight Loss | Jason Fung
🎥 Why Hormones Like Insulin Are Key to Weight Loss – Not Just Calories!
In this eye-opening video, we explore the science behind weight loss and explain why insulin is a far more important factor than just counting calories. If you’ve been struggling to lose weight despite reducing your calorie intake, this video will show you why understanding your hormones is the missing piece to achieving your goals.
🔑 Key Takeaways:
🌟 Learn how insulin affects fat storage and how it can prevent weight loss even when you're eating fewer calories.
🌟 Discover why cutting calories alone isn’t enough, an...
Quick Intermittent Fasting Tips (Advanced) | Jason Fung
4 quick intermittent fasting tips to help you lose weight. Dr Jason Fung covers tips for changing behaviors. First, find group that will support you. Second, give your body time to adjust to intermittent fasting. Third, adopting a low carbohydrate diet is an easier transition to fasting. Fourth, don't make a big deal about it. Check out my blog at https://medium.com/@drjasonfung
More Information:
BOOKS:
The Obesity Code - Reviewing underlying physiology of weight loss and how low carb diets and fasting can help. https://www.amazon.com/dp/1771641258?ref=exp_jasonfung_dp...
Insulin Toxicity (How to Reverse Type 2 Diabetes)
Dr. Jason Fung explains the toxicity of insulin and how it makes diabetics worse, not better. This leads to a discussion of rational treatment to cure diabetes without drugs, without surgery and without cost. Check out my blog at https://medium.com/@drjasonfung
More Information:
BOOKS:
The Obesity Code - Reviewing underlying physiology of weight loss and how low carb diets and fasting can help. https://www.amazon.com/dp/1771641258?ref=exp_jasonfung_dp_vv_d
The Diabetes Code - Reviewing how type 2 diabetes is a reversible disease and dietary strategies. https...
The Food Pyramid Lie: Why we got Fat
Check out Aeira powdered bone broth for managing hunger during fasting at www.drinkaeira.com
For decades, we were told to follow the Food Pyramid. We were told to eat 6-11 servings of bread and pasta a day and fear dietary fat. We followed the rules. But instead of getting healthier, the world got sicker and more obese. Why?
In this video, I expose the truth behind one of the biggest failures in modern nutrition—the Food Pyramid. We explore how the 1977 dietary guidelines, though well-intentioned, were based on shaky science that demonized healthy fats and pr...
Is Saturated Fat Bad? (Science says... No!) Obesity Code Lecture 6
Is eating saturated fat bad for us? Does eating fat cause obesity? Heart disease? Stroke? How did we become so fat phobic? Are vegetable oils healthy? A critical look at the wealth of scientific data suggests that eating fat (total) and saturated fat might actually protect us from disease. Check out my blog at https://medium.com/@drjasonfung
More Information:
BOOKS:
The Obesity Code - Reviewing underlying physiology of weight loss and how low carb diets and fasting can help. https://www.amazon.com/dp/1771641258?ref=exp_jasonfung_dp_vv_d
The...
Does Fasting Destroy Your Muscle? | Jason Fung
Does intermittent fasting destroy muscle? Many people worry about this, but what does the science say? Celebrities like Terry Crews use intermittent fasting to not only lose weight but also build muscle. Learn why fasting does not burn muscle. Check out my blog at https://medium.com/@drjasonfung
More Information:
BOOKS:
The Obesity Code - Reviewing underlying physiology of weight loss and how low carb diets and fasting can help. https://www.amazon.com/dp/1771641258?ref=exp_jasonfung_dp_vv_d
The Diabetes Code - Reviewing how type 2 diabetes is a reversible...
Why Do We get Fat? Part 1 - The Biggest Lie in Obesity Medicine
This is Why You're Not Losing Weight (Its Not Calories) | Dr. Jason Fung
Pre-order The Hunger Code - Out March 2026 at www.doctorjasonfung.com
Visit www.drinkaeira.com for hunger management tools.
Stop counting calories! It's the biggest, most damaging lie in obesity medicine.
In this video, Dr. Jason Fung, the best-selling author of The Obesity Code & The Hunger Code dismantles the single biggest myth in weight loss: Calories
In, Calories Out (CICO).
For decades, we've been told that weight gain is a personal failing—a simple lack
of wi...
The Real Reason You Can't Lose Weight (Hormones and Obesity - a Masterclass)
Have you been told that losing weight is simply about "eating less and moving
more"? For decades, the "Calories In, Calories Out" model has been the gold
standard for weight loss. But what if it is completely wrong?
In this Masterclass, I break down the real reason you can't lose weight:
Hormones. We dive deep into the science of obesity and explore why calorie
counting fails 99% of the time, as proven by massive studies like the Women's
Health Initiative.
Weight gain is not a character flaw or a lack of...
A Conversation with Dr Bosworth | Jason Fung
🌟 Welcome to the Fasting & Longevity Summit 2.0 Series! 🌟
A Conversation with Dr Bosworth | Jason Fung
📢 Don’t Miss the Fasting & Longevity Summit 2.0!
Get exclusive access to interviews with top experts and game-changing fasting insights. Sign up for the Summit before it’s too late!
👉https://drtalks.com/summit/fasting-longevity?uid=828&oid=87&ref=3679
We’re thrilled to launch a groundbreaking new series where Dr. Fung engages in in-depth conversations with world-class experts in health, wellness, and nutrition. Each episode is a journey into transformative health practices that can change your life.
In this episode...
Muscle - The secret endocrine Organ to keep you healthy - A conversation with Dr. Gabrielle Lyon
Why does muscle matter so much—not just for strength, but for fat loss,
insulin sensitivity, metabolism, and long-term health?
In this in-depth conversation, Dr. Jason Fung sits down with Dr. Gabrielle Lyon
to explore why muscle is one of the most misunderstood—and most
important—organs in the human body. This discussion challenges the traditional
calorie-focused model of weight loss and reframes health through a muscle-
centric, hormone-driven lens.
Throughout this 58-minute discussion, you’ll gain clarity on:
● Why muscle plays a critical role in metabolic health and fat loss
●...
A Conversation with Gary Taubes | Jason Fung
A Conversation with Gary Taubes | Jason Fung
📢 Don’t Miss the Fasting & Longevity Summit 2.0!
Get exclusive access to interviews with top experts and game-changing fasting insights. Sign up for the Summit before it’s too late!
👉https://drtalks.com/summit/fasting-longevity?uid=828&oid=87&ref=3679
Welcome to the Fasting and Longevity Summit Series, hosted by world-renowned fasting expert Dr. Jason Fung. In this enlightening episode, Dr. Fung is joined by Gary Taubes, an acclaimed journalist and bestselling author, to discuss the complex relationship between diet, obesity, and chronic diseases. Together, they delve into the scienc...
'Eat Fewer Calories' is the WORST diet plan, ever!
Your body has complex biological systems that influence hunger, metabolism, insulin, fat storage, and energy use. Understanding these systems may help explain why losing weight can sometimes feel difficult—and why sustainable weight management may require looking beyond calories alone.
In this video, we explore the science and ideas behind Automatic Weight Loss and how the body's metabolic state can influence whether it stores energy or uses stored body fat for fuel. 🔬
🧠 In This Video, You'll Learn:
🔹 What does “Automatic Weight Loss” really mean?
🔹 How your metabolism influences body weight
🔹 The connection between insulin and fat storage
🔹...
Intermittent Fasting Benefits (My Top 5) | Jason Fung
Dr. Jason Fung shares 5 important reasons why intermittent fasting is such a great strategy for weight loss. Compared to other weight loss strategies, it has several inherent advantages. It is simple. Fasting is free. Fasting can be used with any diet. Fasting saves time. Most importantly, intermittent fasting works and is the most powerful weight loss tool. Check out my blog at https://medium.com/@drjasonfung
More Information:
BOOKS:
The Obesity Code - Reviewing underlying physiology of weight loss and how low carb diets and fasting can help. https://www.amazon.com/dp/1771641258?ref...
The Obesity Epidemic, Explained
Dr. Jason Fung explains how the 1977 dietary guidelines led to the obesity epidemic. The Dietary Guidelines for Americans changed the way Americans ate, advising us to eat more carbs and less fat to prevent heart disease, but this lead to weight gain. When we gained weight, we were then told it was our own fault. Check out my blog at https://medium.com/@drjasonfung
More Information:
BOOKS:
The Obesity Code - Reviewing underlying physiology of weight loss and how low carb diets and fasting can help. https://www.amazon.com/dp/1771641258?ref=exp_jasonfung...
