Fasting Q&A with Dr Jason Fung: Magnesium, Vinegar, Dawn Phenomenon, and More
The Fasting Method Podcast
Megan Ramos Nutrition Inc
4.8 • 595 Ratings
🗓️ 16 September 2025
⏱️ 28 minutes
🧾️ Download transcript
Summary
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
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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.
Transcript
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| 0:00.0 | it's odd how much we obsess about LDL, considering how much has been known that it's a very |
| 0:05.2 | relatively weak indicator. I've tweeted out a couple of articles in the New England Journal |
| 0:11.6 | Medicine, which is considered sort of the most important medical journal in the world. |
| 0:16.5 | They looked at a number of factors, and there's been a couple of studies like this where they look |
| 0:20.7 | at, you know, what's the most important factor for heart disease for example smoking is one of the most |
| 0:25.3 | important diabetes is very very close and ldl cholesterol had almost no effect it was very striking |
| 0:34.4 | hypertension is sort of medium but it was very striking how little effect |
| 0:39.2 | lowering your LDL really had, considering how much people obsess about it. |
| 0:51.1 | Welcome, everyone, to our monthly Q&A with Dr. Jason Fung as he tackles questions submitted by our |
| 0:57.9 | TFM community members. Hello to our podcast listeners who will be able to listen to our Q&A |
| 1:03.6 | a few weeks after our community members. All right. So let's get started. This first question |
| 1:09.7 | says that I am a healthy 46-year-old working to improve my sleep. |
| 1:14.4 | So I want to take magnesium bisglycinate. My magnesium supplement actually contains seven forms of magnesium, |
| 1:22.9 | including malate, tureate, and others, which is very convenient. But is it better to take just |
| 1:31.1 | one form in one capsule for absorption? I've heard that they're fighting for receptor sites if I |
| 1:38.0 | take several different types at once. In terms of magnesium, I don't know that there's any studies of taking multiple versus one. |
| 1:46.9 | There was a study on different types of magnesium. And really, the only thing that stood out was |
| 1:52.2 | there's one that you should avoid, which is magnesium hydroxide. Now, that's the cheap stuff. |
| 1:57.6 | A lot of places use these blends. And then they say, oh, there's all these different |
| 2:03.0 | ones, including magnesium oxide. But they don't tell you what percentage it is. So I'm always |
| 2:08.5 | thinking that, oh, they're going to give you like 98% magnesium oxide. So, you know, if they |
| 2:14.8 | don't tell you what percentage, then you don't know. And that often gets stuck in there. I know because my son takes magnesium for cramps and stuff. At Costco, there's two, there's magnesium oxide, which is half the price of the magnesium bisclacinate. And then I remember looking at a pharmacy where there was one that's like a blend, which included magnesium oxide. |
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