Fasting Q&A with Dr Jason Fung: Order of Fat Burning, Fasting With a Gastric Sleeve, BMR Fluctuation, GLP-1 Drugs, and More

9 snips

Jul 30, 2024

Dr Jason Fung, nephrologist and fasting researcher known for The Obesity Code, answers community questions on fasting and metabolism. He explains how metabolic tracking devices work and why visceral fat shifts earlier than subcutaneous. He discusses lemon water and teas, GLP-1 drugs as temporary tools, post-gastric-sleeve fasting adjustments, and how fasting affects BMR.

Ask episode

AI Snips

Chapters

Books

Transcript

Episode notes

INSIGHT

Lumen Can Personalize Your Fat Burning Window

Lumen measures exhaled CO2 to infer whether you're burning carbs, fat, or protein during fasting.
Dr Jason Fung explains people vary in timing of the carb→fat switch and Lumen could personalize fasting length to avoid gluconeogenesis gaps.

ADVICE

Avoid Protein Not Tea To Preserve Autophagy

Autophagy is suppressed by protein, not by tiny amounts from herbal tea or lemon water.
Dr Jason Fung says herbal teas or lemon water likely contain negligible protein so they won't meaningfully block autophagy; bone broth contains more protein.

INSIGHT

Visceral Fat Is Lost Faster Than Old Subcutaneous Fat

Fat cells constantly exchange triglycerides so old versus new fat isn't burned in sequence.
Visceral fat is more metabolically active and tends to be mobilized faster during fasting, improving liver fat quickly.

Get the Snipd Podcast app to discover more snips from this episode

Get the app

Episode #163

In this Fasting Q&A episode, hosted by Coach Lisa Chance, Dr. Jason Fung answers questions from the TFM Community: I have a Lumen device and they talk about a fasting 'sweet spot'. They say that if you fast for too long, then your body might get stressed and go back into carb burning, and that if you test with the Lumen every two hours, you can see this switch from carb burning to fat burning and then possibly back to carb burning – in which case it could be a good idea to stop the fast, perhaps doing more shorter fasts to maximize fat burning. Is this true? [01:57]

I have heard conflicting reports about lemon in water and herbal teas breaking your fast. Do they will interfere with autophagy, if that is your main goal? [08:47]
Is it known if there is an order in which fat is burned during fasting? For example, is the recently-gained fat burned first and the oldest last, or visceral vs subcutaneous? [10:52]
My doctor is not discouraging fasting but dismissed it as another means of cutting calories. How can I explain concisely why fasting works but calorie reduction diets don't? [13:55]
What are your thoughts on using GLP-1 drugs in conjunction with fasting? [21:25]
Any suggestions for successful fasting protocols for individuals, post gastric sleeve (3 years)? [23:45]
In his book The Obesity Code, Dr. Jason Fung explains that a large percentage of obesity is genetically determined. Could the outcome of the research also be explained by us getting addicted to sugar before we are born if our mother consumes sugar? [24:56]
Since fish oil contains no protein and thus should not trigger mTOR, isn't it the best fasting aid as it is both and-inflammatory and calming? [29:38]
I know that in some studies in the past they have showed that not having an "up day" after a full fasting day in ADF would lead to a decrease in BMR. Do we still believe this to be true? If I did a 48-hour fast, ate one meal, and then fasted for 24 hours right after, and it wasn't difficult, am I ultimately decreasing my BMR? [30:37]

Please note that you need to be a member of the TFM Community to submit questions to the Q&A webinars with Dr. Fung but you can submit questions to our regular Q&A episodes here: https://bit.ly/TFMPodcastQs

Transcripts of all episodes are available at www.thefastingmethod.com on the Podcast page.

Learn More About Our Community: https://www.thefastingmethod.com

Join our FREE Facebook Group: https://bit.ly/TFMNetwork

Watch Us On YouTube: https://bit.ly/TFMYouTube

This podcast is for educational purposes only and is not a substitute for professional care by a doctor or other qualified medical professional. You should always speak with your physician or other healthcare professional before doing any fasting, changing your diet, taking or adjusting any medication or supplements, or adopting any treatment for a health problem. The use of any other products or services purchased by you as a result of this podcast does not create a healthcare provider-patient relationship between you and any of the experts affiliated with this podcast. Information and statements regarding dietary supplements have not been evaluated by the Food and Drug Administration and are not intended to diagnose, treat, cure, or prevent any disease.