Ask Dr. Jason Fung

Ask Dr. Jason Fung

I’m a big fan of Dr. Jason Fung, the Canadian nephrologist. He’s a world-leading expert on intermittent fasting and LCHF, especially for treating people with type 2 diabetes.

Dr. Fung has agreed to answer questions weekly on our membership site (free trial one month). Members can also read questions and answers from other people:

Jason FungAsk Dr. Jason Fung (for members)

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For more about Dr. Fung visit his website IntensiveDietaryTreatment.com.

You can also check out our popular video interview with him, about the perfect treatment for diabetes and weight loss.

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113 comments

  1. Christina
    What does it mean if you are constantly very hungry even on extended fasts? I’m currently doing a short extended fast (4 days) and continue to get hungrier and hungrier after day 3. Two months ago I did a 10-day water fast, taking in sea salt and magnesium, and was very hungry the entire time, to the point that sleeping was difficult. I also have seen no weight loss. Any idea why I’m feeling so hungry and how to change it?
  2. babita
    Hi Dr Fung.. I am a Type 2 diabetic and lost more than 15 kgs in one year. I am on 12 units of insulin once a day. I wish to gain some healthy weight . I suppose IF and KETO are for weight loss which i have none to loose so kindly help me know how to reverse this disease ?
  3. Kristin Parker Team Diet Doctor

    Hi Dr Fung.. I am a Type 2 diabetic and lost more than 15 kgs in one year. I am on 12 units of insulin once a day. I wish to gain some healthy weight . I suppose IF and KETO are for weight loss which i have none to loose so kindly help me know how to reverse this disease ?

    If you do not want to lose weight, you can still lower your blood glucose and insulin by eating keto! You can sign up for our free two week challenge.
    https://www.dietdoctor.com/low-carb/get-started

    You can read more about getting started on keto while on medication at this link.
    https://www.dietdoctor.com/low-carb/with-diabetes-medications

  4. 1 comment removed
  5. babita
    thanks a lot. can you please guide me how to contact Dr. Jason Fung. I am from India. Thanks
    Reply: #106
  6. Kristin Parker Team Diet Doctor

    thanks a lot. can you please guide me how to contact Dr. Jason Fung. I am from India. Thanks

    You may contact Dr Fung through his website http://www.idmprogram.com

  7. babita
    can we have plant protein on intermittent fasting
    Reply: #108
  8. Kristin Parker Team Diet Doctor

    can we have plant protein on intermittent fasting

    Protein is likely to affect insulin and should be avoided when fasting.

  9. Jorge
    Hello, I recently learned about Dr. Fung and what he teaches about fasting, so have been, for about two weeks now, trying to follow an eight by sixteen ratio of fasting. I had had some health issues a couple of months ago, such as sudden fatigue, much shortness of breath, lots of nervousness, cramping. Once even thought I was having another pulmonary embolism (I had one in 2014). Then, I turned to fasting when realized my symptoms were likely caused by my kidneys not doing their job well, but one night, I woke up in the middle of the night and had some bread, some rice, and some watermelon (broke the fasting+things which trigger insuline), without imagining that the next morning I'd have a crisis: I thought I was going to faint, I was really nervous, could feel my heart beating, and was out of breath after walking only a few steps. Then a doctor that saw me later that day, told me to take metformin + sitagliptin, because my sugar was before lunch, which I've been doing since. That was four or five days ago. So I'm not sure whether taking this medicine will benefit my attemps or intentions of getting better through fasting. I'm willing to stop taking those pills if they wont let fasting do what it should for me. What shall I do, please advice me on whether I should or not take that metformin + sitagliptin. Thank you and God bless!!
  10. Abdel Bady
    Hello, I'm from Belgium, I'm 37 years old I've been sick and obese all my life. It's been 2 months since i've begin Keto nutrition and now I'm almost cured of all disease that as plague all my life and I feel reborn with a more efficient body and mind. I've never been so happy in my life and for the first time i really feel alive. Thank you for saving my life you gave something and never thought possible. If any of you is coming to Belgium I'd be glad and honored to give you a warm and keto welcome you deserve but be warned because if i see you I will hug you because you saved me
    Thank youThank youThank youThank youThank youThank youThank youThank youThank youThank youThank youThank youThank youThank youThank youThank youThank youThank youThank youThank youThank youThank youThank youThank youThank youThank you
  11. mamta
    hi I am on IF since couple of months and want to say that i had reduces only half kgs of weight. I am always in my macros (not keto diet). more than 3 ltrs of water and only home cooked meal. Then why am i not shredding weight.. is there something i am missing? plz help
    Reply: #112
  12. Kristin Parker Team Diet Doctor

    hi I am on IF since couple of months and want to say that i had reduces only half kgs of weight. I am always in my macros (not keto diet). more than 3 ltrs of water and only home cooked meal. Then why am i not shredding weight.. is there something i am missing? plz help

    You may wish to consider lowering your carb count. You can read more here.
    https://www.dietdoctor.com/how-low-carb-is-low-carb

  13. Shireen
    Hi dr fung
    I am currently doing a water fast I am on day 5 . I have about 50 pounds to lose. I Vape for anxiety and migraines. I gained a pound of weight yesterday and I have had only water and cvs vape
  14. Nikhil Bargale
    Hello Dr Fung.

    I am on IF since Apr'19 and its has worked very well for me. I am not over weight , I started IF just as a healthy lifestyle. I am also an active cyclist. How does IF work with High Intensity Interval training. I will starting my training for an event in Jan'20.

    Regards
    Nikhil Bargale

  15. Sim fung
    Hello. I want to ask. I have lost 12 kg for one year after i diagnosed diabetes and doing fasting. Now i am only 45 kg. I now don't know what to do more cause my fbs for this month average 105-108. When i'm fasting it's under 100. Thank you for any suggestion. I without med.
    Reply: #116
  16. Kristin Parker Team Diet Doctor

    Hello. I want to ask. I have lost 12 kg for one year after i diagnosed diabetes and doing fasting. Now i am only 45 kg. I now don't know what to do more cause my fbs for this month average 105-108. When i'm fasting it's under 100. Thank you for any suggestion. I without med.

    Dr Fung does not recommend fasting if you are underweight.

  17. Daya K. Nagar
    Dear DR. Fung

    I am on IF since January, 2019. I have diabetes. I have given below my FG results for your perusal. My HBA1C is 6.1%. My FG has started increasing again and HBA1C is also not decreasing. On Sept. 13 it was below 100 and now it is 112. That is, since September I am not getting results. Why IF has stopped working now? Please suggest.
    21/01/2019 138
    04/02/2019 132
    19/02/2019 115
    05/03/2019 116
    19/03/2019 128
    16/04/2019 117
    02/05/2019 120
    04/06/2019 103
    19/06/2019 111
    02/07/2019 119
    16/07/2019 103
    01/08/2019 114
    16/08/2019 105
    30/08/2019 97
    13/09/2019 93
    01/10/2019 105
    16/10/2019 107
    01/11/2019 106
    15/11/2019 112

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