Fasting Q&A with Dr Jason Fung: Magnesium, Vinegar, Dawn Phenomenon, and More

Fasting Q&A with Dr Jason Fung: Magnesium, Vinegar, Dawn Phenomenon, and More

Author: The Fasting Method September 16, 2025 Duration: 28:15

Episode #223

In this Fasting Q&A episode, hosted by Coach Lisa Chance, Dr. Jason Fung answers questions from the TFM Community:

 

1. I am a healthy 46-year-old working to improve my sleep, so I want to take magnesium bisglycinate. My magnesium supplement actually contains 7 forms of magnesium, which is very convenient, but is it better to just take one form in one capsule for absorption or any other reason? [01:23]

2. Two-part question on TFM's Fat Fasting 

One: Vinegar is not on the list, but you have mentioned that we can eat salads. Would it be okay to make a dressing with a healthy oil and vinegar during a Fat Fast?   

Two: I've seen some mention to only eat 3-4 of the allowed foods on a fat fast. Is this an alternative manner to step up one's game during a fat fast? [03:58]

3. I just read about a study on stem cell research.  Could you elaborate further what this may mean for those with pancreas, liver, or kidney issues? [08:11]

4. Are there any research-based studies that fasting helps lower cholesterol? [09:55]

5. I'm on day four of a water fast and I am noticing a metallic taste in my mouth. Is this unusual? Why does it happen? [13:46]

6. I have various autoimmune conditions and it was suggested I consider going on LDN (low dose naltrexone), and that this can also help with weight loss. I'm wondering what your thoughts are on LDN for weight loss and, if I decided to start it, how I would incorporate it into my fasting schedule. [16:09]

7. What is the difference between The Dawn Phenomenon and Feet-to-Floor Syndrome? From what I can find they both cause a rise in morning blood sugar, one due to circadian rhythm and the other due to a stress response from getting the day started. Is there a different eating/fasting protocol that is best for one over the other, and how do you know which one you are experiencing? [18:14]

8. Is kidney disease the cause of interstitial cystitis and how do you treat it? [21:05]

9. I have high uric acid and also the APOE 4-4 gene. Would the 3T of lime juice recommended for high uric acid affect the neural autophagy I use as a prevention for the dementia risk? What is the best way to navigate fasting with these two needs? [21:59]

10. Are there any dangers to keeping blood sugars in a consistently low range (50-60's mg/dl) if no symptoms of hypoglycemia are felt? [24:55]

11. In some fasting groups on-line, they are big into breaking fasts with watermelon and fruit juices. How do you feel about breaking fasts with these things? [25:39]

 

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 on the Podcast page at www.thefastingmethod.com

 

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Summary Timestamps

00:00 Intro

01:23 Magnesium

03:58 Vinegar on a fat fast

04:56 Importance of monotony on a fat fast

08:11 Stem cell research

09:55 Fasting and cholesterol 

13:46 Metallic taste in mouth on longer fasts

16:09 Low Dose Naltrexone

18:14 Dawn phenomenon vs feet-to-floor syndrome

21:05 Interstitial cystitis

21:59 High uric acid

24:55 Low blood sugar

25:39 Breaking fasts with fruit

 

Disclaimer

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.


For anyone navigating the world of intermittent fasting, sorting through the noise can be the hardest part. The Fasting Method Podcast cuts through that confusion with clarity and authority. Co-hosted by recognized experts Megan Ramos and Terri Lance, Ph.D., this podcast is built on a foundation of real science and practical application. The conversations here move beyond simplistic tips to explore the nuanced physiology of fasting, the psychological hurdles, and the sustainable strategies that lead to lasting health changes. You’ll hear detailed explorations of metabolic adaptation, hormone regulation, and the social complexities of changing one's eating patterns, all grounded in the hosts' extensive clinical and research experience. This is a space where listener questions drive the dialogue, making each episode a direct address to the real-world challenges people face. Tune in for a candid, evidence-based resource that treats fasting not as a trend, but as a deeply personal tool for wellness. The discussions on this podcast are designed to empower you with knowledge, demystify the process, and provide a supportive audio companion for your journey.
Author: Language: English Episodes: 100

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