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.

53 Comments

  1. RS
    Awesome!
  2. Frances Lilian
    I am looking forward to this... much appreciated!!
  3. Murray
    Dr. Fung is superbly empirical. His thinking is driven by clinical results interpreted and guided by science and not medical-nutritional ideology. He exemplifies the exalted tradition of Dr. John Snow and others.
  4. Eric
    I enjoy reading and listening to your presentations.
    I am amazed at how some of these ideas have been around for some time or at the least kissing cousins

    I recently read more about a civil war era Doctor Salisbury
    From my reading he was his time periods ketogenic diet doctor.

    He seems to have been ahead of his time except for his emphasis on lean meat and egg whites and not fat.

    He seems to describe keto adaptation and the need to be strict with no sugar grains or

  5. Jane Rodriguez
    my
  6. Jane Rodriguez
    We Need more Drs like Dr Jason Fung in the medical field he cares about his patients,and not about the volume of patients. I feel as Dr J was talking to me. I will fast, do more excerise and try to reduce my meds.. God bless Dr. Jason.
  7. Joy Carlin Honodel
    I have reduced my diabetes from 7 to 5.9 in my A-1C using your methodology. My fasting BGL was 83 this am and I am off all my metformin. I exercise 7 days walking for 1 hour (3 miles).
    I was given a statin drug for my cholesterol for 2 years and had severe muscle damage and Kidney loss. (notable that this was also the onset of my Diabetes and a 32 lb. weight in one year) I took myself off the statin and symptoms gradually disappeared. Same doc put me on red yeast rice and I had more kidney damage. I am now Stage 3B eFGR 33. I take Benazepril 10 mg TlD. I understand that this is NOT curable. I have found studies that 60mg of Hydrosoluable CoQ10 TlD for a total of 180 mg daily has had good results. Do you concur? I am now referred to a Nephrologist but am struggling in the meantime. I am on Zetia and Fenofibrate now with little results in the last 30 days. Does Zetia take more time to see results? Just askin...
  8. Ninan Cherian
    I am a 66 y/o male and weigh 120 lbs and have been a diabetic for more than 20 years. I also have CAD and had seven stent implants and a quadruple bypass. I am currently on Carvedilol, Clopidogrel, Isosorbide Mononitrate, Atorvastatin, Januvia, Levothyroxine. I take supplements such as COQ10, Baby aspirin, Flaxseed oil, Multi Vit., D3, Calcium, Alpha Lipoic, Chromium, Nephrocomplete, Fish oil. I was on insulin prior to starting Januvia last year but due to resistance my fasting glucose level is 115 to 140. I take chia, hempseed, nuts, berries with oatmeal for breakfast; for lunch I have a low card meal with vegetables and for dinner I have protein diet with vegetables. I have observed if I eat some fruits like pear, apple, orange after dinner, my FGL is in 130-140 level. Could you please tell me what I should do to bring my sugar level under control.
    Reply: #16
  9. cdeam
    I have listened to your videos and am impressed and dispirit to try something. I am a chemo paitient and have had diabetes since 1998. Cancer is in remission but diabetes is out of control. Recently my A1C was 15 and I was put on 50 units of U500 insulin. Doctor is happy my A1C is now 10 after 6 weeks but I am not. I have gained 30lbs, feel sick and tired all the time, blood pressure is very high, and hands and foot are numb. I have young kids and am scared I will not see them grown. Can you help?
    Reply: #50
  10. Devlin
    I have a question about video #3 in which Dr. Fung says you can't sweeten your water or coffee with artificial sweeteners (shows a picture with Truvia in it - which has 0 calories, near 0 GI and 0 GL) but says it's permitted to put cream in your coffee...! WHAT!!??? I'm not a user of sweeteners in any form but am wondering how sugar alcohols with 0 calories break your fast and cream (with lactose, protein and fat in it) does not....
    Reply: #17
  11. Roy
    loved the interview on Diabetes and Weight Loss, So many things said that I have just guessed or really known. However I do have a question, what should be monitored the most with a type 1 diabetic and implementing a LCHF diet ?
    Reply: #18
  12. Robert
    Just started LCHF Diet with good result in Weight loss. However, I could not find any article on the LCHF diet on High Blood Pressure. Can anyone help?
    Reply: #19
  13. Jim Little
    You are sure you want to be associated with Jimmy Moore? Wondering if its a good idea for your credibility as a doctor
  14. luis tapia
    do you have information on this program in spanish??
    Reply: #20
  15. Judy Stephens
    Doing great things for my husband who is hypertensive and diabetic. Is there a doctor in the Minneapolis/St. Paul area that you could recommend? One who shares your views?
  16. Zepp
    Go for a more strikt LCHF diet att first!

    http://www.dietdoctor.com/low-carb

    Skip all those seed att first.

  17. Zepp
    Its mostly about getting rid of that sweet taste?

    Everything dont need to taste sweet.

    If you persist that everything should taste sweet, then you have to battle that.

    Get rid of that first!

  18. Zepp
    Type 1 is different frome type 2!

    Type 2 can get rid of all the carbs they can.. thats almoste beneficaly.. less is better.

    Type 1 have another problem.. stay on 50-100 grams a day, then you have easyer to monotoring insulin.

    Less carbs, less wrong on insulin.. in safe regions.

    50-100 grams a day is farly little anyhow?

    Make it be veggis and/or some few rot fruits/berries/fruits mostly!

  19. Zepp
    Its for moste the same diet.. becuse its often The metabolic syndrome behind both.
  20. Chris
    Hello Dr Fung,
    I am a 55 year old RMA for a busy Nephrologist which makes what I'm about to say all the worse. It seems I've managed to pull the trigger on the loaded gun that I've been carrying, and now have full blown type 2 DM. Of course my PCP started me on the usual Metformin 100 mg daily (creatinine 0.7, no proteinuria), which has been very effective at lowering my A1C to the higher end of the normal range.
    I had not lost any weight and was still experiencing periodic elevated BS throughout the day for about one year, when I was doing some internet research and found your site. I immediately began the IF LCHF plan and voila........I am down 5kg in one month, and have not experienced any elevated Glucose issues at all. I'm due to see my PCP for my quarterly DM follow-up and I will let you know the results of my tests. I have no doubt my lipids and A1C have improved as well as my blood pressure. It will be interesting to hear the comments from my PCP! Thank you so much for shedding some light on this epidemic!
  21. ken sarasin
    nkyou
  22. Jason Boh
    I'm a T2 diabetic for about 1 year and just found out only last month. Doctors in Singapore have told me it's not reversible as mine is inheritory in my family.

    Do you have any suggestions how to go about? I read many different opinions on the medications given out today to T2 people and the damages it has done. My medication falls into this category.

    Please advice.

    Jason Boh.

  23. alan nove
    Dr. Jason Fung,

    Our Grand-daughter (13 yrs old) has type 1 diabetes, and still in her honeymoon phase. Would like your thoughts on getting her into LCHF diet to reduce stress on her pancreas, and maybe making her life more normal.

    She has doctor here in Anchorage who would work with you - I believe.

    One thing, she is very very thin, as went into coma from starving before discovered that she was type 1 diabetic.

    Please respond if you can assist or you know someone who can. We are happy to take her to your practice in Canada.

    Alan

    Replies: #25, #27
  24. bill
    I'm disappointed nobody has responded yet.
    First, please get Dr. Richard K. Bernstein, MD's
    book Dr. Bernstein's Diabetes Solution, the
    Complete Guide to Achieving Normal Blood
    Sugars. It will tell you just about everything
    you should know. Next would be going to
    typeonegrit on facebook. You can get lots
    of questions answered there quickly.
    Best wishes for your granddaughter's
    health.
  25. 1 comment removed
  26. Peter Biörck Team Diet Doctor
    Hi Alan!
    If you want to contact Dr Fung directly. I recommend to use his web site:
    https://intensivedietarymanagement.com/contact/

    If you are a member at Dietdoctor.com then you can direct your questions to Dr Fung here. But that is meant to be used for questions of a general character, not private consultation.

    http://www.dietdoctor.com/member/ask-the-experts

    Dr. Jason Fung,
    Our Grand-daughter (13 yrs old) has type 1 diabetes, and still in her honeymoon phase. Would like your thoughts on getting her into LCHF diet to reduce stress on her pancreas, and maybe making her life more normal.
    She has doctor here in Anchorage who would work with you - I believe.
    One thing, she is very very thin, as went into coma from starving before discovered that she was type 1 diabetic.
    Please respond if you can assist or you know someone who can. We are happy to take her to your practice in Canada.
    Alan

  27. Sal
    Hi I would like to ask Dr Jason Fung a question. I am Type-2 diabetic and have been doing intermittent fasting for a week. I have burning feet and they are very painful that I cannot sleep at night. My doctor told me it is due to my diabetes. Would lowering my blood sugar and having a LCHF diet will stop the burning sensation in my feet? Please advice.

    Thank you

    sal

    Reply: #29
  28. Peter Biörck Team Diet Doctor
    Hi Sal!

    If you are a member at Dietdoctor.com then you can direct your questions to Dr Fung here (soon):

    http://www.dietdoctor.com/member/ask-the-experts

    Hi I would like to ask Dr Jason Fung a question. I am Type-2 diabetic and have been doing intermittent fasting for a week. I have burning feet and they are very painful that I cannot sleep at night. My doctor told me it is due to my diabetes. Would lowering my blood sugar and having a LCHF diet will stop the burning sensation in my feet? Please advice.
    Thank you
    sal

  29. Miguel
    [Question at the end]

    I've started ketosis on August 12th 2016 and I had some full blown cheat days (Aug 20 & 21, like 300 carbs/day) during those 2 days I had 8 people out of 9 that was basically very against ketosis and that last person was a doctor who did Atkins in the past and he did answer my questions regarding long term but for the major part of that journey I did stick to it.

    I am not diabetic so I don't think I ever produced ketones in my life. My last blood test which was pre-keto was at 5.9 and I could feel my health deteriorating day by day.

    Almost all my symptoms pre-keto went away but I feel it has introduced a new one. Yes I had the ketosis flu but I believe I am passed that and that issue is still there.

    I believe I am now keto adapted and I really really really REALLY have a hard time adapting to ketones and of course it was worst during keto flu. I feel like I am potty training again. I can never tell if I will pee 1 teaspoon or pee a normal amount, it's REALLY annoying and frustrating because the URGE TO PEE is present constantly throughout the day!

    I even went through I'm pretty sure Adrenal Fatigue just a couple days ago (which is part my fault, stress & exercise, I thought I had a UTI, but I don't think it was starvation, I was at 1500-1700 cals and eating almost always the same things, following macros 70/20-25/5-10 , about 5% fibre minimum/day) and MY HORMONES WENT OUT OF WHACK LITTERALLY!! No sex drive and feeling weird down there.

    I am 29 yrs old, 5' 11'' & now 153-160 lbs (I started at 166 lbs, lowest 153). Just a couple days ago, I started eating 1700-2100 cals and more veggies & eating limited amount of fruits which I didn't eat before (strawberries, blackberries, raspberries) and also drinking warm water with lemons squeezed in to bring my pH more to neutral as I had a urine test and was high in acetone which is I believe normal on ketosis but I felt like this acid pH may have been causing some issues.

    I'm wondering after being long term keto adapted if this feeling of constant urge to pee even after JUST peeing will go away ? I feel like I could go 20+ times to pee if I didn't control myself and I can't tell in advance if it's going to be a 1 teaspoon pee or a normal pee. I feel like I'm potty training all over again! ^_^

    Thanks for your time!

  30. Adrineh Y.
    I need Dr. Jason Fung's office phone #.Thanks!!!
  31. Deborah
    Hi

    I have been doing Ketogenic for 5 weeks. For the past week I have been so angry and irritable. I am not craving anything. I have only lost 7 pound in that time. I am 58 years old. I eat 5% carbs, 20% protein and 75% fat. Lots of butter and coconut oil. Can you help me?

    Thank you

    Reply: #34
  32. Deborah
    P.S. My hyperactive thyroid was treated with Radioactive Iodine and I am on Amour Thyroid medication for hypothyroidism.
  33. Peter Biörck Team Diet Doctor
    Hi!

    It could be the induction flu:
    https://www.dietdoctor.com/low-carb/side-effects#inductionflu

    7 pound is not so bad if it continues to go downward.

    Hi
    I have been doing Ketogenic for 5 weeks. For the past week I have been so angry and irritable. I am not craving anything. I have only lost 7 pound in that time. I am 58 years old. I eat 5% carbs, 20% protein and 75% fat. Lots of butter and coconut oil. Can you help me?
    Thank you

  34. james wyper
    hello,
    I have been doing the intermediate fasting since 12/20/16,i am also takeing insulin,i am a surgical diabetic and so far I have had no issues with just eating once aday.
  35. christian Rivera
    Hello Dr. Fung,

    My name is Christian Rivera and I have reactive hypoglycemia and I
    have tried everything to cure my condition with eating and exercise
    and have no success. I have heard that fasting can cure many diseases
    but Dr's frown on fasting with hypoglycemia. What is your opinion on
    fasting with hypoglycemia and is it safe and possible.

    Thank you Dr. Fung and I look forward to hear from you.

    Regards,

    Christian Rivera

    Reply: #37
  36. Peter Biörck Team Diet Doctor
    Hi Christian!

    If you are a member then you can direct questions to Dr Fung here:
    https://www.dietdoctor.com/member/ask-the-experts/dr-jason-fung-new

    Hello Dr. Fung,
    My name is Christian Rivera and I have reactive hypoglycemia and I
    have tried everything to cure my condition with eating and exercise
    and have no success. I have heard that fasting can cure many diseases
    but Dr's frown on fasting with hypoglycemia. What is your opinion on
    fasting with hypoglycemia and is it safe and possible.
    Thank you Dr. Fung and I look forward to hear from you.
    Regards,
    Christian Rivera

  37. Cindy
    My question is
    I am 54
    I do HIIT training no less then 3 days a week..
    I would say I am pretty muscular..
    I lost 80 lbs 3 years ago but menopause I believe
    Has made me gain 30 lbs back
    I eat basically clean healthy..
    That being said.. I tried doing keto diet plan and it seem to
    Make my hot flashes worse..
    I am now trying isagenix and my hot flashes have stopped all together but I am concerned because the products do
    Have fructose in them and I am use to clean foods
    I also loved to fast for 16 hours daily.. which I don't do since
    Staring the isagenix.. I would love to go back to low carb
    But when I did it before I lost nothing
    Just wanting something that works..
  38. Shirley
    In desperate need of help.
    My name is Shirley, I've been on keto woe for 3 months now. It's working great, tons of wnergy, much better sleep, down 23 lbs and since I'm 55 and in menopause thus is literally the only thing that is working for me. However, last week I started having some really high heart rates. Had an ekg which was ok, labs done. Thyroid ok, and electrolytes ok.
    Wore a halter monitor for 2 days and turns out it's sinus rythems tachycardia. I've read and read and Google everything I can think of. I can't help but think it has something to do with keto and all my chemistry changes. I've never had heart issues. It's extremely frustrating. Any suggestions would be hugely appreciated. I will do anything I can. I'm not willing to quit. Thank you so much!
  39. Adrineh
    Hi Dr. Fung,
    I am Type 2 Diabetic, have a fatty liver, overweight 45-50 lbs. I am doing intermittent fasting,
    but I am trying to get a faster result to get rid of this disease. I found a Medical clinic in Mexico, the Dr's name is Micheal Hino, who helped lots of people from all over the world, they treat MS, cancer, knee issues and T2D treatments.They helped over 48,000 people for T2D in 16 years. I contacted them for my T2D and Fatty Liver, also trying to get more information before decide what to do. Based on their information , They have two types of stem cell treatments, One is 8 days Umbilical Cord Stem Cell treatment and the other one is 6 days Embryonic Stem Cell treatment, Both treatments have follow up appointment with more treatments. Both treatments will improve quality of life and assist to decrease or eliminate medications. Obviously the Embryonic Stem Cell treatment is far superior but is normally for more chronic and life threatening disorders. I need your advise since I read your books and watched all your videos. Thanks!!!
  40. Rick
    Question for the Good Doctor; I have been on a ketosis diet for 2 months. I've lost 29 lbs.. I'm a type 2 diabetic. My A1C was 7.0 in August and has been falling for 2 years. I'm now 2 months into the KD and my ketones are running 80 to 120 on the pee stick. But my blood glucose is running 240 to 360 with 80% fat and 20% veg's. I feel great for 63 years old and have plenty of energy. Can you help...explain...should I have concerns?
    Added info: started at 276 now 237. Could you recommend a doctor in the St. Louis MO area or good reading material.
    I know your busy but anything would help.
  41. Jeremy
    Hello

    I have questions in regards in how to break a 40 day water fast. I have read many places that it needs to be slow, about 1 day for each 4 days of fasting. I'm looking for tips on what to eat and how to avoid refeeding syndrome and edema seem to be the biggest concerns. Some places say no salt and other sources highly recommend sea salt (i only eat Himalayan pink salt anyways) any advice would be greatly appreciated! Thanks

  42. Katie
    Hi, I'm 37 y/o female who has been eating according to the Obesity Code book for 1 week. I have IGA Nephropathy, well controlled alpha 1 antitripsin deficiency ZZ, and auto immune issues (positive ANA, dx of colitis/crohns: presents usually as colitis but sometimes as crohns. I have a colonoscopy every 2-3 years since 2005. Results in chronic athritis, rashes, and mouth ulcers), and anxiety/depression that has been well managed since 2012. I was on remicade infusions but stopped when I got pregnant in July 2015. I've been fasting by skipping either dinner or breakfast each day. I am eating enough food that I dont feel starving and not eating so much that I'm sick but I feel terrible: low energy, very bloated, terrible acne (i dont normally have acne issues) have gone up a pants size in one week, and am getting downy hair on the sides of my face. I'm not sure what is happening. My friends who are doing the same program look and feel great. Rx include Lialda, Vyvanse, Pristiq, and Forvivo. I'm not sure what to do or what could be happening. Any ideas? Thank you
  43. Laurie
    Dear Katie.
    I don’t think Dr Fung is reading answering these comments.
    Also I don’t think anyone from dietdoctor has seen it.
    As a retired health professional, I don’t think it is advisable for anyone with the major health issues you have should undertake any major changes to nutrition without expert medical advice.
    Also usual Dr Fung’s advice is if you feel unwell, stop.
  44. Tersmani Carrasquillo
    I need more information on the available program and I need the book on intermediate fasting.
  45. Karen
    Dr Fung, what do you think of the long term risks of ketogenic or high fat diets in causing insulin resistance? I’ve been reading a lot of articles saying that this is a real concern in people following high fat diets long term... is there truth to these claims?
  46. Karen
    This is for example one article I read: https://www.masteringdiabetes.org/ketosis-ketogenic-diets-misleading/
    And when I looked for more evidence into the link between high fat (low carb) diets and insulin resistance, there does seem to be a connection... I’m just trying to look objectively at the evidence presented by both sides, so that I can do the right thing for my health and that of my patients, without causing more harm.
    Reply: #48
  47. Gentiann
    The link you refer to is a vegan site.
    Of course they'll attack ketogenic diets. Unfortunatly, it's them who are misleading people.
  48. Karen
    yes I agree... I realize that article was written by pro vegans and so has some bias.... I really just want to get to the truth... I recently found another article written by a non vegan ND which also has points against keto: http://drchristianson.com/is-the-ketogenic-diet-safe-for-those-with-t...
    Any thoughts on these concerns?
  49. LN
    It sounds as if what has happened to you is exactly what Dr Fung describes and the fasting could really help you. As a foodie fasting is not easy, but also not impossible ..keep busy and extend fasting periods with pampering occupations such as long, lovely bath. If you do 'fall off the wagon' just climb straight back on.

    I have listened to your videos and am impressed and dispirit to try something. I am a chemo paitient and have had diabetes since 1998. Cancer is in remission but diabetes is out of control. Recently my A1C was 15 and I was put on 50 units of U500 insulin. Doctor is happy my A1C is now 10 after 6 weeks but I am not. I have gained 30lbs, feel sick and tired all the time, blood pressure is very high, and hands and foot are numb. I have young kids and am scared I will not see them grown. Can you help?

  50. Jude
    Hi Dr. Fung

    I would like to communicate with you about IF/Fasting in general for HIV+ people interested in fasting to renew new cells?

    Please advise asap

    Thanks in advance

    From Partner of HIV+ wife

    I look forward to your speedy response

    Yours respectingly

    Fasting Student

    Reply: #52
  51. Peter Biörck Team Diet Doctor
    Hi Jude!

    Members can ask Dr Fung shorter general questions here:
    https://www.dietdoctor.com/member/ask-the-experts/dr-jason-fung-new

    If you would like to come in contact with Dr Fung then I would try this page:
    https://idmprogram.com/contact/

  52. sampath
    I started alternate day fasting a month ago and i went down from 205 to 188 as of today. my bloodpressure has become normal, my heart pulse rate has come down to 60. I thank Dr. jason fung for educating everyone on fasting.
  53. Charles
    I am 20 years into being a Type 2 diabetic and 8 months ago diagnosed with MG; I am too weak to exercise plus have constant low back pain from a failed back surgery. I use a mobility scooter and wear a patch over the eye that will not lift or focus because of the MG. I thought I was on a lot of meds for diabetes, cholesterol and heart failure, now I am really on a lot of meds! I have been taking cbd cream for my back pain, and it works so well and I heard that it can help with diabetes, I signed up to rep a company that has the oil (with no THC). Do you know if this would help?

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