Metabolic Flexibility and How the Lumen device can help with Fasting | Jason Fung
Thanks to Lumen for sponsoring! Go to to get 15% off your Lumen today.
Hi, I'm Dr. Jason Fung. Today, we’re diving into metabolic flexibility – what it is, why it matters, and how you can measure it with a simple handheld device called Lumen. This video is sponsored by Lumen, and you can get a discount with the code below!
Metabolic flexibility is the ability of your body to switch between burning glucose and fat for energy. This is crucial for adapting to different energy needs and maintaining good health. With the Lumen device, you can easily measure your metabolic flexibility at home by tracking the carbon dioxide you exhale.
In this video, we’ll cover:
Metabolic Flexibility – Understand how your body switches between burning carbs and fat.
Lumen Device – Learn how this device measures your respiratory exchange ratio (RER) to determine what fuel your body is using.
Importance of Metabolic Flexibility – Discover why being metabolically flexible is essential for preventing obesity, insulin resistance, and diabetes.
Scientific Studies – Explore research showing how Lumen can help diagnose and improve metabolic flexibility.
Practical Tips – Get advice on using fasting and diet adjustments to enhance your metabolic health.
Whether you're looking to optimize your metabolism or learn more about metabolic health, this video has valuable insights for you. Don’t miss out!
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if you want to try the lumen for yourself, You can get a 15% off code : www.lumen.me/fung
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▶️ Timestamps / Chapters
00:00 Intro
00:30 Metabolic flexibility
01:53 Feeding – Insulin Rises Stores Sugar and Fat
04:23 How much Glucose Burning depends on
07:00 Response to glucose load ( carbohydrates )
07:56 Obesity Facts
08:48 Lumen help fasting
11:00 Outro
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📌 BOOKS:
👉 The Obesity Code – Reviewing underlying physiology of weight loss and how low
carb diets and fasting can help. ?…
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#MetabolicFlexibility #Lumen #wightLoss2024 #jasonfung #drjasonfung #drfung #fung #nutrition #diet #health #fasting #intermittentfasting
Thank you Dr.Fung
Posted 20 seocnds ago!? Wow I’m so early 😅 I’m from Scarborough, Dr.Jason Fung – small world I must say. Thank you for the work you do!
If you have limited CO2 diffusion capacity due to interstitial lung disease will this device still provide useful feedback?
Been looking at getting one of these but it’s so expensive on top of the monthly subscription.
I’ve been using Lumen (and fasting) for a few months now and am down 30kgs (66 pounds) since I started. Really insightful tool.
Wow🎉that’s awesome!! Well done!
Dr. Fung is my personal hero! He saved me from MANY diseases & and have outlived my Mother’s age when she contracted cancer! Thank you Sir!❤
The Lumen Device, just in time for Severance Season 2
So ready for season 2
Prof Bikman just did a video on this yesterday 😊 but didnt recommend any products. If these tools like Lumen, CGM etc were more affordable we could all be healthier and Metabolically flexible.
What about an interview with Dr Ken Barry. Both of your things promote autophagy
So very interesting. I have lost 77 Lbs thanks to your guidance. Sadly as Lumen is an American company, the cost for Canadians gets too high for may of us to buy. Between exchange rates and duty it is sadly outside of my budget.
Went to the Lumen site, where it looks like this device has to be paired to a cellphone. I’m not going to do that, so, no thanks.
Might be helpful 👍
In ketosis since last week and I am even faster on bike and can sustain high average speeds for long rides. I bring small packs of nut bars and usually come back home without opening a one! Water has been enough and if I feel a bit lightheaded, I take a big pinch of salt, problem solved. 4 kilo down so far (9 days * 250±50g fat = ~2kg fat loss). Much easier to maintain as long as I avoid alcohol and sleep well. Mostly eggs, tuna, salmon, ground beef, some raw and cooked greens.
How exactly is Lumen used? Like practically?
I sort of always trusted Dr Fung because he did not promote or use sponsorships…..I’m probably wrong but my feeling is once they start with sponsorships or their own products, things start going off the rail.
Not always. This is helpful.
I am hesitant using a lumen as I am not a fan of subscription. Also I don’t know if the information is safe as it could be sold to insurance companies. This might allow insurance companies from providing coverage if the results point to a potential disease. I would like to know if you can use a lumen without putting in any personal information and not using a subscription
İ was curious about the Lumen a few years ago but then I read all the comments on Amazon from disappointed users concerning accuracy (numbers changed between different measures taken immediately one after another). One user said it was worthless. I don’t see the item listed on Amazon now. That is what I like about Amazon: user reviews.
Did Lumen address the accuracy issue and if so, what did they do exactly?
Just purchased the tester using your discount code… I test my glucose and ketones daily so this will be cool to check my carbon throughout the day.
Appreciate the help to understand this new tool. I see the comments “poo pooing” you, your motivation for producing this video and the value of the device. I see it as an advancement, sort of like using a thermometer to measure a fever. Yes, a mama’s touch can detect a fever in her child. How much and. If it’s dangerous is made easier to know with a good tool.
I’m gaining back a lot of ground in my heath situation with the fasting and low carb dieting. There will be a time when I will want to finesse information to do a better job. I’m working through healing from a TBI, metabolic problems, SSRI ” discontinuation” and carrying too much fat right now. Learning new things is a bit challenging. Having this video I can repeat and research this and bring it into my personal routine.
Thank you Dr. Fung
after reading your all three books i m doing I.F. from past 4 years n it is miraculous sir thank you so much 😊 love love from India 🙏🏻🙏🏻