Jason Fung

Learn more about Ancestral Supplements:
Code: FUNG
Link: https://ancestralsupplements.com/FUNG

(Disclosure: This video was sponsored by Ancestral Supplements. Note that I use this brand personally at this moment because I believe in a whole food supplement)

Most people still believe weight gain is simply about calories.

But if calorie restriction alone worked long-term, why do so many people struggle?

In this conversation, Dr. Jason Fung sits down with Julia from Ancestral Supplements to explore the hormonal model of weight gain, insulin, ultra-processed foods, and how modern eating...

Is salt bad for our health? Should we follow a low salt diet? An in-depth analysis of available data and the surprising conclusion. A low salt diet does not lead to less heart disease or stroke. 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...

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...

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...

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...

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 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...

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...

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...

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
●...

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
🔹...

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...

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...

Jason Fung shares the basics of Intermittent Fasting, the who, what, when and how including some tips for 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 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

...

How financial conflicts of interest have corrupted modern medicine, from the medical journals to the universities. Studies that support drugs are published where those that don't are not, producing a corrupted version of reality. 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...

Hi, I’m Dr. Jason Fung, and welcome to Part 3 of the Diabetes Code Clinic, where we focus on reversing Type 2 diabetes through proven methods. If you missed Parts 1 and 2, I recommend watching those first, as we discussed what Type 2 diabetes is and introduced the low carbohydrate diet.

In today’s video, we’re diving deeper into the low carbohydrate diet and why it’s one of the most effective approaches for reversing Type 2 diabetes. The key to managing this disease lies in understanding how blood glucose levels are affected by what you eat. Using tools like the glyc...

Dr. Jason Fung provides a detailed description of the physiology of fasting, what happens to our body as we stop eating. Knowing this may help you lose weight. The body transitions by first using glucose from the food. In the second stage, it breaks down glycogen into glucose. In the third stage, it uses protein to make glucose, a phase called gluconeogenesis. After that, the body sustains itself mainly on stored fat. Check out my blog at https://medium.com/@drjasonfung

More Information:
BOOKS:

The Obesity Code - Reviewing underlying physiology of weight loss...

Why intermittent fasting is much more effective for weight loss than simple calorie restriction. Fasting allows insulin to fall which allows the body to use its stores of body fat for energy, where simple cutting of calories may or may not do so. Just cutting calories does not fix the hormonal changes 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...

Do calcium supplements prevent osteoporosis? Are they harmful? The difference between calcium in food and supplements. A cautionary tale of how bad science led to widespread use of a potentially toxic substance - the calcium supplement. 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...

Dr. Jason Fung shares why calorie counting doesn't work. Our hormones control how many calories we eat (Calories In) and our metabolic rate (Calories Out), so losing weight means we need to fix this hormonal imbalance, not just eat a few less calories. 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...

Most people are told to eat less, count calories, and “try harder.”
But what if that advice is the real reason so many people struggle with weight and health?
In this broadcast, we dive deep into why controlling hunger matters more than counting calories, and how your body’s hormones—not willpower—play the biggest role in fat loss and metabolic health.
You’ll learn:
● Why calorie restriction often backfires

● How hunger is driven by hormones like insulin

● Why feeling hungry all the time is NOT your fault

● What actually helps you e...

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...

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...

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...

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...

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
...

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...

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...

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...

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...

Welcome back to The Diabetes Code Clinic, hosted by Dr. Jason Fung. If you missed Part 1, we covered the fundamentals of Type 2 Diabetes, including how it develops and how to start reversing it. In this episode, we dive deeper into the powerful role of a low-carb diet in achieving remission of Type 2 Diabetes.

Learn why Type 2 Diabetes is essentially an overflow problem caused by excess sugar in your body and how reducing carbohydrate intake can help manage and even reverse this condition. Dr. Fung explains:
✔️ The role of three macronutrients (proteins, fats, carbohydrates).
✔️ Why carbohydrates are unne...

The first big lie is that Type 2 Diabetes is chronic and progressive. The second lie is that treatment of blood sugar is the primary target of therapy. 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...

I’m sharing my personal experience with the fasting mimicking diet (FMD). I’ll break down how it works, the science behind it, and whether it’s worth trying.
I’ve been talking about fasting since 2014, but one of the few researchers exploring
fasting at the time was Dr. Longo in California. He discovered that fasting triggers
beneficial repair processes in the body, but fasting for five days can be tough. That’s
where the fasting mimicking diet comes in — it allows you to eat small amounts of
specially designed foods while still keeping your body in...

Dr. Jason Fung explains how and why all calories aren't the same. The term 'A Calorie is a Calorie' assumes that only the amount of calories is important and not the type of calories. Yet different calories have different hormonal effects on our bodies which impacts their fattening effect. 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...

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 an...

📌 Advanced Dietary Strategies to Reverse Type 2 Diabetes Naturally
How to Lower Blood Sugar Without Cutting Carbs | Dr. Jason Fung Explains
In this video, Dr. Jason Fung shares 9 powerful and science-backed strategies to
lower your blood glucose levels without completely cutting out carbohydrates from
your diet. If you’re struggling with type 2 diabetes, insulin resistance, or prediabetes
— this video will give you practical, effective, and sustainable methods to regain
control of your health.

🕒 Topics Covered:
00:00 – Introduction: Lower Blood Sugar Without Cutting Carbs
(Advanced dietary strategies to manage type 2 diabetes naturally.)
00:21 – W...

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...

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...

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
⏱️...

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...