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
● How low muscle mass contributes to insulin resistance and weight gain
● Why focusing only on calories often leads to failure
● The connection between muscle, fasting, and metabolic flexibility
● How muscle loss accelerates aging and chronic disease risk
● Practical ways to preserve and build muscle without extreme dieting
● Why hormones—not willpower—drive long-term weight regulation
Dr. Gabrielle Lyon explains how muscle functions as a metabolic organ,
influencing blood sugar control, energy production, and longevity. Dr. Jason Fung
adds crucial insight into how insulin, fasting, and metabolic health intersect with
muscle preservation—especially for people struggling with stubborn weight gain.
This video is especially valuable if you:
● Are losing weight but still feel metabolically unhealthy
● Struggle with insulin resistance or slow metabolism
● Want sustainable fat loss without damaging muscle
● Care about longevity, strength, and aging well
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To dive deeper into muscle-centric health, explore Dr. Gabrielle Lyon’s
Playbook:
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⏱️ Chapters / Timestamps
00:00 – Why Muscle Matters So Much (Intro & Core Idea)
02:15 – Dr. Gabrielle Lyon: Muscle Is More Than Strength
05:10 – Muscle as a Metabolic Organ Explained
08:00 – How Low Muscle Mass Affects Fat Gain
10:45 – Insulin Resistance, Muscle & Weight Loss
13:30 – Hormones vs Calories: A Broken Model
16:40 – Why Traditional Dieting Fails Long-Term
19:30 – Muscle, Metabolism & Energy Production
22:15 – Aging, Muscle Loss & Chronic Disease Risk
25:10 – Intermittent Fasting and Muscle Preservation
28:20 – Can You Lose Fat Without Losing Muscle?
31:15 – Protein Intake, Muscle & Metabolic Health
34:00 – Muscle-Centric Health vs Weight-Centric Health
37:10 – Exercise, Resistance Training & Longevity
40:00 – Common Myths About Muscle and Fat Loss
43:15 – What Most People Get Wrong About Metabolism
46:20 – Practical Steps to Build & Protect Muscle
49:30 – Sustainable Fat Loss Without Starvation
52:10 – Long-Term Health, Longevity & Muscle Mass
55:00 – Final Thoughts: Rethinking Muscle & Health
57:10 – Closing Message & Key Takeaways
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�� YouTube Medical Lectures (for specialist physicians)
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Fasting and Weight Loss – Solving the…
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Can’t wait to finish this one.
im high off cocaine and 500mg of test rn
?
2 biggest stars of the true nutrition in one place 😉
🙏🏽🙏🏽🙏🏽
Too much protein takes me out of ketosis and I stop losing weight…
Same here
If I go over 25 grams or 30 grams in a meal (even with a big weight training session – and I am no amateur – though I am not a body builder- I am out of ketosis for hours and even over night.) This wouldnt be so bad if I didnt require my ketones for better cognitive function and mental stability…. but I can find no way around the lower protein. I weight 120-125 23% bodyfat and lift every other day with cardio and a few additional walks in the day zone 2 as I enter menapause…. I fast 24 hours alternate days… and still I cant figure out how to work the protien. Additionally I find i am really hungry when I consume more protein than my ketogenic lifestyle allows for. Its so bizzare! N=1??
Look at the Insulin Index of food. Meat is right up there with bread. Meat is not that great in large quantities. These people will learn one day.
@StellaAestheticsI mean… The insulinogenic effect of amino acids depends heavily on the metabolic state the body is in when protein is consumed. Someone who is fasted or following a low-carb diet responds very differently to protein than someone eating a standard American diet. Even so, I find that personally I have a hard time maintaining the blood ketone levels I want.
@ConsciousCaroline Protein needs a lot of Insulin to be broken down into useable form and digested regardless of the “state” you are in.
@StellaAestheticsHere’s a lecture by Ben Bikman on this exact subject.
https://youtu.be/z3fO5aTD6JU?si=wgrrBkcp4fksa5H5
I really like how Dr. Fung is also allowing for a better understanding that we do not need to be lifting seriously heavy weight. Resistance training could be very effective using your own body weight and despite my respect and admiration for Dr. Lyon…. the push on protein doesnt appear to help my body. I am able to sprint, lift heavy, maintain muscle…. all without the heavy protein. I live a ketogenic lifestyle and IF and I do not find 1 – 2 grams of protein per body weight do anything but make my body fat % rise, increase my hunger levels and I do not feel all that great. WHEN my body tells me I need more protein, I will add more but that is not the daily message I get.
When i was getting into body building at a young
lady, I used to force the high protein and that did help with bigger muscles but I didnt feel well- even then. Additionally, I am not seeking that physique any longer. Lol!
The whole endocrine system is very dynamic. Good or bad, things can happen very quickly. Thank you both for sharing your research with the public, may it lead to a healthier society.
Excellent!
There is no doubt that skeletal muscle is important. Unfortunately that is not the root cause. I lifted all my life and by the time I was 60 I was 235 and a 5-ft frame with plenty of muscle is and 65 lbs of fat.
The root cause always will be diet.
Carnivore restored me to the same muscle mass and wait I had at 26 coming out of the military.
Stop with the filler and the surgery Gabrielle. You come off as extremely narcissistic. I like natural. We all age. Please accept it like a mature adult.
Let her be ,Douglas, it’s her life
@natetalbert4289simp, grow a pair.
Hi Dr. Fung! I was in line at the grocery store the other day and was happy to see you on the cover of Women’s World magazine! Congrats!! 😄🎉
You’ve been a huge part of my journey to better health. Thank you! 💚
5:00 Book-forever strong
13:00 Skeleton muscle as endocrine organ
18:00 Resistance training
32:00 1.2-1.6g protein/kg of body weight
42:00 Kidney health; need more protein as we age
49:00 Processed high carb intake worse for kidneys
51:00 Recovery
55:00 Purposeful friction
Awesome interview! I continually thank you Dr Fung for helping me start my journey over six years ago now, losing 160 lbs, reversing ALL my health issues by learning how to fast. I happened upon one of your interviews back then, also lectures and books. I’ve already pre ordered The Hunger Code.😃. I’m 62 now, maintaining well on a ketovore diet, I swim regularly and I’ve increased my protein and added a bit of weights. Our bodies are amazing. Thank you for teaching me that 😊.
I love my Death Wish coffee.
Im get more from listening to what Dr Lyons is saying .
That was a good conversation. I never thought of muscle as an endocrine organ, but it does act as a glucose sink, so it must be. Generally muscle is built in the gym for good looks. There’s so much more to muscle, and you have so many of them. They are hard at work, so you might as well strengthen them. Good talk, and a departure from the usual fasting, metabolic syndrome, diabetes topics.
Being a nurse in a nephrology unit it was great to hear some learning on what they should focus on in their diet! I have seen so many wither away so quickly !
Thanks for interviewing Dr Gabrielle Lyon. Washington University in St Louis is one of the best medical schools.
Great interview, great information. Thank you Drs Fung and Lyon!
I love wagyu steak. Yummy…wagyu steak. (19:50) Resistance training (weight lifting) is the key to change your wagyu steak into filet mignon. Yummy… filet mignon. Great interview. I went to get the book while watching this video. Will tell my patients.