OB Health Podcast

Dr Jason Fung Says Calories Don't Matter. He's Wrong. (Fasting Debunked)

38 min · 1. juli 2026
episode Dr Jason Fung Says Calories Don't Matter. He's Wrong. (Fasting Debunked) cover

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To sign up for my coaching: https://ob-health.com/Dr Jason Fung, the man who made intermittent fasting mainstream, went on The Diary of a CEO and said calories in, calories out is a myth, and that fasting is the simplest way to kill belly fat. As a fitness coach who's worked with over 1,000 clients, I have to break this down, because the whole thing rests on one idea that's just wrong: that insulin, not calories, is what makes you fat.Here's the truth: insulin's main job is lowering blood sugar, not storing fat (bodybuilders literally inject it to build muscle). You can eat 10,000 calories of butter, barely move your insulin, and still gain fat. And every version of fasting Fung recommends works for one reason only: it puts you in a calorie deficit. The catch he never mentions is muscle. Compared to a normal deficit, long fasts cost you more lean mass, wreck your hormones, and teach you nothing about nutrition. Strip his advice down and it's just "don't eat."I go through the insulin myth, the "your metabolism speeds up when you fast" claim (it doesn't), the leptin mix-up, and the one thing we actually agree on: fiber. Fasting can be a useful tool to stay in a deficit (I use a 16:8 window myself), but it is not magic, and it is not the reason you lose fat.CHAPTERS0:00 "The simplest way to kill belly fat" (Fung's claim)1:58 Insulin is NOT the fat-storage hormone (the butter test)2:08 The Twinkie Doctor who ate junk and lost 20 pounds2:52 The study that ends the insulin vs calories debate6:22 Fung got attacked for inventing modern fasting9:37 Your metabolism is driven by weight, not fasting (Eric Lee)10:13 The "starvation mode" myth and the 2,200-calorie claim13:40 What fasting actually is: say it with me, a calorie deficit14:04 The "just don't eat" consultation (advice with no substance)18:34 Fasting costs you muscle (the MrBeast problem)27:21 Where he's wrong about leptin29:23 Where we finally agree: fiber37:45 The verdict (and my 126g-of-fiber confession)Credit: original clip featuring Dr Jason Fung from The Diary of a CEO ("The Fasting Doctor" episode). Go watch the full episode on their channel.Want coaching that builds muscle and teaches you to actually eat, instead of just starving you? Apply to work with my team at OB Health: https://ob-health.com/If this helped, like and subscribe. I react to these every week.This channel is educational and is not medical advice. Talk to your doctor before fasting, especially if you are diabetic, pregnant, or on medication.Credit: original clip "The SIMPLE Way To Make Your Body KILL BELLY FAT! | Dr Jason Fung" by The Diary Of A CEO Clips. Watch it here: https://youtu.be/n6eFeUwodu8#drjasonfung #fasting #intermittentfasting #insulin #caloriedeficit #bellyfat #diaryofaceo #obesitycode #fatloss #OBHealth

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84 episodes

episode 8 Habits That Add Years to Your Life (Backed by Real Studies) artwork

8 Habits That Add Years to Your Life (Backed by Real Studies)

To sign up for my coaching: https://ob-health.com/If there was a pill that lowered your risk of death by 12%, and every dose lowered it again, you'd take it without thinking. That pill exists. It just isn't a pill. In this episode I break down 8 science-backed habits proven to lower your all-cause mortality and add years to your life, every one tied to real studies (with the participant counts and the effect sizes).We cover why walking 4 miles a day (spread out, not all at once) beats almost everything, why fiber is the most underrated longevity tool on earth, why low muscle mass raises your risk of death by 57%, why grip strength predicts how long you'll live, and how just 60 minutes of resistance training a week moves the needle. Plus protein, cardiovascular fitness, and exactly how much you actually need to train.This isn't fluff. It's the highest-percentage, most actionable stuff, and you can start today.CHAPTERS0:00 The "pill" that lowers your risk of death0:35 #1 Steps: the 12%-per-1,000 rule (and why spreading them out wins)3:06 #2 Fiber: 10 grams = 10% lower mortality7:17 #3 Muscle mass (57% higher risk if it's low)9:05 #4 Grip strength: the surprising predictor10:45 #5 Resistance training (60 minutes a week)12:00 #6 A higher-protein diet14:45 #7 Cardiovascular fitness (VO2)16:15 #8 How much you actually need to train17:41 The truth about GLPs, and where to startWant a coach and a plan that dials all of this in for you? Apply to work with my team at OB Health: https://ob-health.com/If this helped, like and subscribe. New episodes weekly.This channel is educational and is not medical advice. Consult your doctor before big changes to your diet or exercise.#longevity #livelonger #allcausemortality #healthspan #fiber #muscle #vo2max #protein #sciencebased #OBHealth

8. juli 202618 min
episode Insulin vs Calories: What Really Makes You Fat artwork

Insulin vs Calories: What Really Makes You Fat

To sign up for my coaching: https://ob-health.com/Insulin isn't making you fat. If someone told you that carbs and sugar spike your insulin and force your body to store fat, this video breaks down why that story falls apart the second you look at the actual research. The real driver of fat gain is simpler than the insulin scare, and once it clicks, calories, carbs, and cravings stop feeling confusing.In this one I walk through the famous Twinkie Diet, where a nutrition professor ate mostly junk food in a calorie deficit for about ten weeks, lost 27 pounds, and watched his cholesterol and triglycerides improve because of the weight loss itself. I break down what controlled high-carb versus low-carb studies actually show when calories and protein are matched, why extended fasting can cost you muscle if your protein and training aren't dialed in, and why the carnivore diet "works" for so many people even though the meat itself isn't magic. I also cover what really drives insulin resistance (stored body fat, chronic overeating, and being inactive, not the carbs on your plate) and why building muscle makes your body handle carbs better, not worse. You'll walk away knowing exactly what calories control (your body weight), what your macros control (your muscle and body composition), and what your fiber and micronutrients control (your health, your hunger, and how you feel).CHAPTERS0:00 The lie: insulin, sugar, and carbs aren't making you fat0:48 What insulin actually does (it lowers blood sugar)2:08 The Twinkie Diet that broke the insulin myth3:05 High-carb vs low-carb: same calories, same result4:14 Sugar and seed oils aren't the villain4:45 Why carbs before a workout actually help5:59 The 3-diet study: why protein wins6:31 The fasting obsession (and the muscle cost)8:28 Carnivore and keto: why they "work"9:21 It's not one magic thing10:44 Calories, macros, micros: what each one controlsReady to actually lose the fat and keep it off with a coach in your corner instead of guessing? Apply for 1-on-1 coaching at https://ob-health.com/If this cleared a few things up, hit like and subscribe so more of these show up on your feed.This video is for educational purposes only and is not medical advice. Talk to your doctor before changing your diet, training, or medication.#FatLoss #InsulinResistance #CalorieDeficit #WeightLoss #FitnessMyths #Nutrition #CarnivoreDiet #IntermittentFasting #Macros #HealthyEating

8. juli 202611 min
episode You Can Buy Skinny Now. You Can't Buy This. artwork

You Can Buy Skinny Now. You Can't Buy This.

To sign up for my coaching: https://ob-health.com/We've entered the age where you can buy skinny. A shot, a jab, a prescription, and the weight comes off. But here's what no needle can give you: a strong, healthy body that people actually respect, and the discipline that built it. That's the one thing money can't shortcut, and it's the premise of this episode.I've coached thousands of people, from nine-figure CEOs to pilots to real estate agents, and the ones who keep their results all do the same thing. They stop obsessing over how low they can push their calories and how fast they can hit a number, and they start asking better questions: How heavy can I lift with good form? Am I getting stronger? Do my clothes fit better? They train in seasons, they build the habits first, and they learn to "deny their flesh" before they earn the freedom to relax.This is why 95% of people gain the weight back, why deadline dieting for a wedding always rebounds, and why the discipline you build in the gym quietly transfers to your relationships, your work, and your income. If you're tired of the yo-yo, this is the mindset shift that finally makes it stick.CHAPTERS0:00 Stop chasing the scale, start chasing strength0:21 You can buy skinny, but you can't buy your dream body1:42 Seasons: why you have to "deny your flesh" first1:57 Why 95% of people gain the weight back2:58 It gets harder the longer you wait4:17 The hidden damage of dieting wrong4:54 The marathon mistake: dieting for a deadline7:15 Why discipline transfers to everything8:43 The real estate agent who got fit and made more money10:07 Why 75 Hard is a trap10:31 Do what no one else willWant to build the kind of body and discipline you can't buy in a bottle? Apply to work with my team at OB Health: https://ob-health.com/If this hit home, like and subscribe. New episodes weekly.#discipline #mindset #ozempic #weightloss #selfimprovement #motivation #fatloss #habits #fitnessmotivation #OBHealth

3. juli 202610 min
episode You're Doing Progressive Overload Wrong (How to Actually Build Muscle) artwork

You're Doing Progressive Overload Wrong (How to Actually Build Muscle)

To sign up for my coaching: https://ob-health.com/Progressive overload is the one principle that actually builds muscle and makes you stronger, and almost everyone gets it wrong. In this episode I break down exactly how to progress in the gym in a simple, practical way you can use tomorrow, whether you're a man or a woman.We cover what progressive overload really is (it's not just adding weight), how hard you should actually train (reps from failure and the right rep range), why soreness and "the burn" are NOT signs of growth, exactly when to add weight, and why you should be resting way longer between sets than you think. Then the part most people skip: recovery. Sleep, protein quality (not just quantity), fats, magnesium, and fiber are what actually let the muscle grow.If you've been training hard and not seeing results, this is almost certainly why.CHAPTERS0:00 Intro0:22 What progressive overload actually is (3 ways, including recomp)2:15 How hard to train: reps from failure and rep ranges3:36 The soreness and "the burn" myth4:50 How to progress in practice (when to add weight)5:28 Rest periods: why you should be "lazy" (2 to 5 minutes)6:39 Why getting weaker mid-workout is a good sign8:22 Recovery starts with sleep (the daylight savings effect)10:54 Protein: quantity AND quality (skip the collagen)11:01 Fats, magnesium, and fiber for recovery11:44 Walk off the soreness (skip the massage gun)12:36 RecapWant a program and a coach that dials all of this in for you? Apply to work with my team at OB Health: https://ob-health.com/If this helped, like and subscribe. New episodes weekly.This channel is educational and is not medical advice. Consult a professional before starting a new training program.#progressiveoverload #buildmuscle #hypertrophy #gettingstronger #musclegrowth #gymtips #fitness #strengthtraining #reptips #OBHealth

1. juli 202612 min
episode Dr Jason Fung Says Calories Don't Matter. He's Wrong. (Fasting Debunked) artwork

Dr Jason Fung Says Calories Don't Matter. He's Wrong. (Fasting Debunked)

To sign up for my coaching: https://ob-health.com/Dr Jason Fung, the man who made intermittent fasting mainstream, went on The Diary of a CEO and said calories in, calories out is a myth, and that fasting is the simplest way to kill belly fat. As a fitness coach who's worked with over 1,000 clients, I have to break this down, because the whole thing rests on one idea that's just wrong: that insulin, not calories, is what makes you fat.Here's the truth: insulin's main job is lowering blood sugar, not storing fat (bodybuilders literally inject it to build muscle). You can eat 10,000 calories of butter, barely move your insulin, and still gain fat. And every version of fasting Fung recommends works for one reason only: it puts you in a calorie deficit. The catch he never mentions is muscle. Compared to a normal deficit, long fasts cost you more lean mass, wreck your hormones, and teach you nothing about nutrition. Strip his advice down and it's just "don't eat."I go through the insulin myth, the "your metabolism speeds up when you fast" claim (it doesn't), the leptin mix-up, and the one thing we actually agree on: fiber. Fasting can be a useful tool to stay in a deficit (I use a 16:8 window myself), but it is not magic, and it is not the reason you lose fat.CHAPTERS0:00 "The simplest way to kill belly fat" (Fung's claim)1:58 Insulin is NOT the fat-storage hormone (the butter test)2:08 The Twinkie Doctor who ate junk and lost 20 pounds2:52 The study that ends the insulin vs calories debate6:22 Fung got attacked for inventing modern fasting9:37 Your metabolism is driven by weight, not fasting (Eric Lee)10:13 The "starvation mode" myth and the 2,200-calorie claim13:40 What fasting actually is: say it with me, a calorie deficit14:04 The "just don't eat" consultation (advice with no substance)18:34 Fasting costs you muscle (the MrBeast problem)27:21 Where he's wrong about leptin29:23 Where we finally agree: fiber37:45 The verdict (and my 126g-of-fiber confession)Credit: original clip featuring Dr Jason Fung from The Diary of a CEO ("The Fasting Doctor" episode). Go watch the full episode on their channel.Want coaching that builds muscle and teaches you to actually eat, instead of just starving you? Apply to work with my team at OB Health: https://ob-health.com/If this helped, like and subscribe. I react to these every week.This channel is educational and is not medical advice. Talk to your doctor before fasting, especially if you are diabetic, pregnant, or on medication.Credit: original clip "The SIMPLE Way To Make Your Body KILL BELLY FAT! | Dr Jason Fung" by The Diary Of A CEO Clips. Watch it here: https://youtu.be/n6eFeUwodu8#drjasonfung #fasting #intermittentfasting #insulin #caloriedeficit #bellyfat #diaryofaceo #obesitycode #fatloss #OBHealth

1. juli 202638 min