IF and LCHF and T2D
Batpapaw
Posts: 13 Member
I'm looking for a little insight as I am doing this without my doctor's assistance. He told me to lose weight then put me on insulin. At the time I knew nothing about insulin, what it's function was or what I should do. I was diagnosed with T2D about 1.5 yrs ago and changed my eating habits drastically. Quit Mt Dew and cut way back on other sugars and carbs but not enough. I was doing the eat 5 times a day deal and was losing no weight. He changed 1 of my meds and I dropped 30lbs pretty quickly then plateaued. Because of a bad blood test he took me off that med and put me on insulin and the weight started coming back on. I heard that T2D could be reversed so I started searching the internet for information and in the process found a lot of good information on insulins effect on the human body and realized my insulin was too high making me insulin resistant and he was giving me more. Didn't make sense to me. After over 30 hours of looking at and listening to other Doctors research I took myself off the insulin, started eating more LCHF and doing Intermittent Fasting. I've been doing this for about 4 weeks and found what I think is my IR lessening. Today I threw caution to the wind when the family and I went to the State Fair and I ate all kinds of "bad" stuff. Lots of carbs. About 90minutes after eating a funnel cake I decided to check my blood glucose and found it to be 104. Now I'm no doctor but it appears to me that "my" insulin is doing its job and without any outside assistance from an injection of more. Any thoughts on this would be appreciated. Thanks.
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Replies
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Hmm. YMMV, but for me, I hit my max BG around 30 minutes after I eat something. Though 60 and 90 minute BG checks are useful for determining recovery time, they're usually nowhere near peak (though I don't have any recent experiences with funnel cake, elephant ears, etc.! )
Sounds like a good guidebook on Diabetes might be useful. ?? If so, Dr. Richard K. Bernstein's Diabetes Solution is a great reference. His YouTube vids are also gold mines.
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Good for you! Clearly, you don't need injected insulin.3
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@Batpapaw best of continued success.1
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You might benefit by checking out our collection of diabetic topics in the sticky section:
http://community.myfitnesspal.com/en/discussion/10482542/diabetic-discussions#latest
and we're working on an Everything Diabetes thread. You'll find that in that link as well.2 -
Well that is good news.!If what I have read about intermittent fasting and diabetics is true - you would be proof of that. Congratulations! Have you been resourcing Dr. Fung and his books/website? If not, I encourage you too as he will back up what you are finding to be true. How long were you fasting at a time?0
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In terms of reversing, check these out:
https://www.virtahealth.com/research
https://www.youtube.com/watch?v=oNZsfluh0Uo
https://www.youtube.com/watch?v=Jd8QFD5Ht18&index=4&list=PLrVWtWmYRR2C8Lc8kn5qAmsSewdmssmmb
https://www.youtube.com/watch?v=KxbWw5jwzHs&index=8&list=PLrVWtWmYRR2C8Lc8kn5qAmsSewdmssmmb
and since you brought up IF:
https://www.youtube.com/watch?v=eUiSCEBGxXk&index=11&list=PLrVWtWmYRR2C8Lc8kn5qAmsSewdmssmmb
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Sounds like you are making great progress!!! Keep it up!!!1
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Dr. Fung is in the last video there. His website is Intensivedietarymanagement.com. His books are The Obesity Code and The Complete Guide to Intermittent Fasting.2
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Sounds like you are doing well. I also agree that it sounds like you may not need insulin if your BG came down like that without it.
But like another poster, my highest BG is about 30 minutes after eating and by 1.5 hours later my BG is almost always lower than it was before I ate. If I just went with before and 90 minute BG checks, my BG would look pretty good.
BUT if I eat higher carb, like state fair higher carb, for more than a day my BG goes up and stays up for a while. I consider my insulin resistance to be controlled and not cured because if I went back to a higher carb diet I am SURE my BG would go up again. KWIM? Be careful not to go down that slippery slope.
I second the recommendation for Fung's Obesity Code. That book is largely what you are doing now. His blog IDM (intensive dietary management I think) might be interesting for you to read.
I hope you have continued success.2 -
Here is also a video by Megan Ramos (works with Dr. Fung) at Ketofest this year. She speaks about Intermittent Fasting.
https://www.youtube.com/watch?v=EhPSpgsOEW41 -
Dr Fung is where I got the ideas to do what I'm doing. I have not read his books but have watched at least 30 hours worth of interviews and lectures he has given. I told my Endo I needed off the insulin so I could lose weight and he just wanted to change my meds and keep me on 26units of insulin a day. I just took myself off it and keep a close eye on my BG and what I eat.....most of the time.3
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I've just started making bone broth and kale smoothies if anyone has any good recipes. I'm trying to get use to the flavor of drinking grass. Lol1
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I've just started making bone broth and kale smoothies if anyone has any good recipes. I'm trying to get use to the flavor of drinking grass. Lol
With all the great tasting LCHF foods, I am not sure why anyone would eat/drink anything that doesn't taste good.
If you decide you want to continue drinking grass, there are lots of recipe site links in the Launch Pad for this group, some of which will include smoothie options.2 -
I've just started making bone broth and kale smoothies if anyone has any good recipes. I'm trying to get use to the flavor of drinking grass. Lol
I'd skip it especially if you're not enjoying it. Dr Bernstein (Diabetes Solutions) demonstrated how blended green vegetables test positive for sugar from blending where they barely register if simply chewed. So unless you love it, there may be as much of a benefit as you think to any smoothie
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Sounds like a good guidebook on Diabetes might be useful. ?? If so, Dr. Richard K. Bernstein's Diabetes Solution is a great reference. His YouTube vids are also gold mines very informative in his area of expertise, which clearly doesn't include fasting.
I know better than to rave indiscriminately about anything or anyone, and I just got a reminder of this watching Dr. Bernstein's August 2017 Q&A teleseminar.
For months, Dr. Bernstein has studiously avoided familiarizing himself with Fung's approach and has professed ignorance when asked by listeners about fasting.
After admitting he has no clue what intermittent fasting is, he flatly pronounced fasting to be "a myth" , thus tossing the work of Fung, Longo, etc., into the diabetes diet dumpster...
Bernstein's real point seems to be that if you follow his diet for T2D, your carb level is already very low but you'll start to lose muscle if you also stop eating protein for "a day or longer."
IF discussion starts around 19'10":
https://youtu.be/slRtZ70Yn0s
@Batpapaw @cstehansen @nvmomketo
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@RalfLott
There is so much conflicting info on IF and muscle sparing. I really am not confident in its benefits, nor am I confident of its negative As far as I can tell, most lose the most muscle within the first few days of a fast - days 1-3 approximately. Shorter and longer seems to be fine but I could be way off.
I wonder if IF is not as bad for those who are ketogenic since we tend to miss the effects of early fasting since we are already fat adapted?
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For me, IF just happened after being keto for a while. I went close to 24 hrs a couple times just because I wasn't hungry. However, since I am not overweight and don't have fatty liver, i assumed longer fasts were not the answer for getting my BG down further.
Turns out I may be wrong - which I don't mind.
I did my first 48 hour fast 2 weeks ago. Since then, my morning FBG dropped from an average of about 121 to 107. I ended my second 48 hour fast at dinner last night, and my reading was 91 this morning.
Obviously, that is just one reading, but it is the lowest I have had since I started checking over a year ago.
After the first fast, I saw almost no rise from that substantial drop over the next 10 days except one morning after I had significantly overeaten the night before (around 2500 calories for dinner), and even that was only to 122 which was pretty much my pre-fast average.
I will continue to track and see if this drop (in full or part) is sustained. Even if it is only sustained for a couple weeks, fasting 48 hours every couple of weeks to get these results seems well worth it to me.4 -
There has to be some lean tissue loss during fasts. The glucose must come from somewhere. It's unavoidable. The muscle sparing comes from the point at which you begin making ketones, if you aren't already. Because at that point a larger portion of your total energy can be fueled by fat instead of glucose. For the fat adapted, we start immediately being able to use ketones on fasts but that still leaves about 130g of glucose a day that must come from somewhere. A little of that will come from glycerol in fat metabolism but at least half, probably more, will come from lean tissues.
You have to decide if it's worth it. If you're obese, you probably also have more total muscle from carrying the weight so you can afford to spend some in the pursuit of better total health. Probably some of it comes from connective tissues and even skin too. If you're not particularly overweight, it might be counter productive to a goal of better body composition. The cost of the lost muscle might not be worth it.
For autophagy in disease treatment, again, that's a different context where it may be worth it for the benefit of total health.
And more importantly you need to include feasting with any fasting. You don't want to combine fasting with daily calorie restriction go extended periods of time.0 -
Autophagy is not just for those with disease. It is a necessary process for everyone. Art De Vany and others have done some pretty interesting analysis of existing data showing the benefits of fasting for everyone. For some IF is enough. For some, longer fasts are needed.
The 130g commonly sited is based on the brain needing about 500 calories a day, so if ALL of it comes from glucose, that is about 130g. However, only about 1/4 of that MUST be glucose. 3/4 of that energy need can be fueled by ketones. When you knock that number down to 30-35, the amount from glycerol that is in every triglyceride that breaks down will make up a larger percentage than when you try to come up with 130.
Also, given that amino acids (protein) are continuously being broken down and recycled, and some of them are damaged and unable to be recycled, you will be losing that protein anyway. Why not use it instead of getting it from diet? This is actually one of the reasons fasting is associated with healthier mitochondria, slower aging and improved health is it helps the body get rid of these damaged materials.
I will say, I work out much harder than most people a decade or two younger than me and I did not reduce intensity or duration of workouts during either of these fasts. I did not feel any negative effects. In fact, the first workout after the first fast, I noticed I had to increase the weights being used to generate the same level of effort.
Tearing down of muscle for energy, from the medical research I can find, is more associated with eating in a hypocaloric manner (under eating) than it is with true fasting. If you have research showing otherwise, please share. I am never afraid of being wrong. I want to have the correct information.
I had avoided fasting (outside of IF just because I wasn't hungry) because being at healthy weight, without fatty liver and a relatively low body fat %, I could find no studies showing BG benefit for someone like me. All the studies centered on those who were obese or had fatty liver. It was only through frustration that I could not get my BG lower was I willing to give it a shot. Turns out I was wrong and fasting does seem to be helping me with my BG control.
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I wasn't able to read all of the response yet but I do want to say that the brain is not the only thing the body requires some glucose for. That's why it's around 130g of glucose a day.0
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I've heard or read, can't remember where, that basic glucose needs for brain, RBC's, etc. becomes lower once fat adapted. I seem to remember 60 g or so but I am not sure.
I believe that I have also read that those who are fat adapted, or a few days into a fast, can use the glycerol backbone of fatty acids to make glucose. I think that was why muscle wasting wanes after the first few days of fasting. But again, I am not sure. I could be remembering this very wrongly.cstehansen wrote: »...
Tearing down of muscle for energy, from the medical research I can find, is more associated with eating in a hypocaloric manner (under eating) than it is with true fasting. If you have research showing otherwise, please share. I am never afraid of being wrong. I want to have the correct information.
I had avoided fasting (outside of IF just because I wasn't hungry) because being at healthy weight, without fatty liver and a relatively low body fat %, I could find no studies showing BG benefit for someone like me. All the studies centered on those who were obese or had fatty liver. It was only through frustration that I could not get my BG lower was I willing to give it a shot. Turns out I was wrong and fasting does seem to be helping me with my BG control.
So if maintaining, the rate of muscle loss during a fast is not as great? Or do they more say it has to do with anorexic states - once there is little fat to use for fuel so protein starts being used?
I've fasted a few few times, and the BG benefits were great. That is what Fung's Obesity Code is based on. Lower BG lasted a week or so too. It is the only thing that keeps my fasting BG low - dawn phenomenon is my norm.1 -
I'm looking for a little insight as I am doing this without my doctor's assistance. He told me to lose weight then put me on insulin. At the time I knew nothing about insulin, what it's function was or what I should do. I was diagnosed with T2D about 1.5 yrs ago and changed my eating habits drastically. Quit Mt Dew and cut way back on other sugars and carbs but not enough. I was doing the eat 5 times a day deal and was losing no weight. He changed 1 of my meds and I dropped 30lbs pretty quickly then plateaued. Because of a bad blood test he took me off that med and put me on insulin and the weight started coming back on. I heard that T2D could be reversed so I started searching the internet for information and in the process found a lot of good information on insulins effect on the human body and realized my insulin was too high making me insulin resistant and he was giving me more. Didn't make sense to me. After over 30 hours of looking at and listening to other Doctors research I took myself off the insulin, started eating more LCHF and doing Intermittent Fasting. I've been doing this for about 4 weeks and found what I think is my IR lessening. Today I threw caution to the wind when the family and I went to the State Fair and I ate all kinds of "bad" stuff. Lots of carbs. About 90minutes after eating a funnel cake I decided to check my blood glucose and found it to be 104. Now I'm no doctor but it appears to me that "my" insulin is doing its job and without any outside assistance from an injection of more. Any thoughts on this would be appreciated. Thanks.
Good work!!!
If you haven't found them yet you might want to check out 2ketodudes. They did a self funded ketofest in New London CT last month. They have podcasts, a website and a forum chocked full of great info on T2D and using keto as a tool to reverse it.
https://www.ketogenicforums.com/
http://2ketodudes.com/
links to all the podcasts are there.
Also Jenny Ruhl has great info about taking charge of your disease. My fav of her books is Diet 101:The Truth About Low Carb Diets. She has gathered a lot of research and has great references on everything from supplements, to diet, to meds you might want to take, etc. Well worth your time to investigate her works.
All the best to you on the rest of your Journey, you are just getting started .
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I've heard or read, can't remember where, that basic glucose needs for brain, RBC's, etc. becomes lower once fat adapted. I seem to remember 60 g or so but I am not sure.
I believe that I have also read that those who are fat adapted, or a few days into a fast, can use the glycerol backbone of fatty acids to make glucose. I think that was why muscle wasting wanes after the first few days of fasting. But again, I am not sure. I could be remembering this very wrongly.cstehansen wrote: »...
Tearing down of muscle for energy, from the medical research I can find, is more associated with eating in a hypocaloric manner (under eating) than it is with true fasting. If you have research showing otherwise, please share. I am never afraid of being wrong. I want to have the correct information.
I had avoided fasting (outside of IF just because I wasn't hungry) because being at healthy weight, without fatty liver and a relatively low body fat %, I could find no studies showing BG benefit for someone like me. All the studies centered on those who were obese or had fatty liver. It was only through frustration that I could not get my BG lower was I willing to give it a shot. Turns out I was wrong and fasting does seem to be helping me with my BG control.
So if maintaining, the rate of muscle loss during a fast is not as great? Or do they more say it has to do with anorexic states - once there is little fat to use for fuel so protein starts being used?
I've fasted a few few times, and the BG benefits were great. That is what Fung's Obesity Code is based on. Lower BG lasted a week or so too. It is the only thing that keeps my fasting BG low - dawn phenomenon is my norm.
I think the brain needs reduced to around 40-50g glucose but red blood cells (and other stuff I can't recall) also require it.
This explains the brain needs but it's not the only need as I understand
https://experiment.com/u/3f3C9g0 -
cstehansen wrote: »Autophagy is not just for those with disease. It is a necessary process for everyone. Art De Vany and others have done some pretty interesting analysis of existing data showing the benefits of fasting for everyone. For some IF is enough. For some, longer fasts are needed.
The 130g commonly sited is based on the brain needing about 500 calories a day, so if ALL of it comes from glucose, that is about 130g. However, only about 1/4 of that MUST be glucose. 3/4 of that energy need can be fueled by ketones. When you knock that number down to 30-35, the amount from glycerol that is in every triglyceride that breaks down will make up a larger percentage than when you try to come up with 130.
Also, given that amino acids (protein) are continuously being broken down and recycled, and some of them are damaged and unable to be recycled, you will be losing that protein anyway. Why not use it instead of getting it from diet? This is actually one of the reasons fasting is associated with healthier mitochondria, slower aging and improved health is it helps the body get rid of these damaged materials.
I will say, I work out much harder than most people a decade or two younger than me and I did not reduce intensity or duration of workouts during either of these fasts. I did not feel any negative effects. In fact, the first workout after the first fast, I noticed I had to increase the weights being used to generate the same level of effort.
Tearing down of muscle for energy, from the medical research I can find, is more associated with eating in a hypocaloric manner (under eating) than it is with true fasting. If you have research showing otherwise, please share. I am never afraid of being wrong. I want to have the correct information.
I had avoided fasting (outside of IF just because I wasn't hungry) because being at healthy weight, without fatty liver and a relatively low body fat %, I could find no studies showing BG benefit for someone like me. All the studies centered on those who were obese or had fatty liver. It was only through frustration that I could not get my BG lower was I willing to give it a shot. Turns out I was wrong and fasting does seem to be helping me with my BG control.
I realize autophagy is for more than just disease treatment.
I just think it's misguided to suggest that muscle won't be sacrificed. In some cases it makes perfect sense to do it but in others, like for weight loss in relatively normal weight person, it's probably taking two steps back to take one step forward.
I say this based on a few people I'm aware of achieving a near underweight BMI but still having higher bodyfat. One woman kept fasting because she believed it would tighten up her abdominal skin through autophagy. Now she has very low muscle and is still overfat at 5'6" and 115 pounds.1 -
Sunny_Bunny_ wrote: »I've heard or read, can't remember where, that basic glucose needs for brain, RBC's, etc. becomes lower once fat adapted. I seem to remember 60 g or so but I am not sure.
I believe that I have also read that those who are fat adapted, or a few days into a fast, can use the glycerol backbone of fatty acids to make glucose. I think that was why muscle wasting wanes after the first few days of fasting. But again, I am not sure. I could be remembering this very wrongly.cstehansen wrote: »...
Tearing down of muscle for energy, from the medical research I can find, is more associated with eating in a hypocaloric manner (under eating) than it is with true fasting. If you have research showing otherwise, please share. I am never afraid of being wrong. I want to have the correct information.
I had avoided fasting (outside of IF just because I wasn't hungry) because being at healthy weight, without fatty liver and a relatively low body fat %, I could find no studies showing BG benefit for someone like me. All the studies centered on those who were obese or had fatty liver. It was only through frustration that I could not get my BG lower was I willing to give it a shot. Turns out I was wrong and fasting does seem to be helping me with my BG control.
So if maintaining, the rate of muscle loss during a fast is not as great? Or do they more say it has to do with anorexic states - once there is little fat to use for fuel so protein starts being used?
I've fasted a few few times, and the BG benefits were great. That is what Fung's Obesity Code is based on. Lower BG lasted a week or so too. It is the only thing that keeps my fasting BG low - dawn phenomenon is my norm.
I think the brain needs reduced to around 40-50g glucose but red blood cells (and other stuff I can't recall) also require it.
This explains the brain needs but it's not the only need as I understand
https://experiment.com/u/3f3C9g
Good srticle.
You are right, the brain is not the only (obligate) consumer of glucose, but I think it is the largest... I wish I could remember my source...1 -
Sunny_Bunny_ wrote: »cstehansen wrote: »Autophagy is not just for those with disease. It is a necessary process for everyone. Art De Vany and others have done some pretty interesting analysis of existing data showing the benefits of fasting for everyone. For some IF is enough. For some, longer fasts are needed.
The 130g commonly sited is based on the brain needing about 500 calories a day, so if ALL of it comes from glucose, that is about 130g. However, only about 1/4 of that MUST be glucose. 3/4 of that energy need can be fueled by ketones. When you knock that number down to 30-35, the amount from glycerol that is in every triglyceride that breaks down will make up a larger percentage than when you try to come up with 130.
Also, given that amino acids (protein) are continuously being broken down and recycled, and some of them are damaged and unable to be recycled, you will be losing that protein anyway. Why not use it instead of getting it from diet? This is actually one of the reasons fasting is associated with healthier mitochondria, slower aging and improved health is it helps the body get rid of these damaged materials.
I will say, I work out much harder than most people a decade or two younger than me and I did not reduce intensity or duration of workouts during either of these fasts. I did not feel any negative effects. In fact, the first workout after the first fast, I noticed I had to increase the weights being used to generate the same level of effort.
Tearing down of muscle for energy, from the medical research I can find, is more associated with eating in a hypocaloric manner (under eating) than it is with true fasting. If you have research showing otherwise, please share. I am never afraid of being wrong. I want to have the correct information.
I had avoided fasting (outside of IF just because I wasn't hungry) because being at healthy weight, without fatty liver and a relatively low body fat %, I could find no studies showing BG benefit for someone like me. All the studies centered on those who were obese or had fatty liver. It was only through frustration that I could not get my BG lower was I willing to give it a shot. Turns out I was wrong and fasting does seem to be helping me with my BG control.
I realize autophagy is for more than just disease treatment.
I just think it's misguided to suggest that muscle won't be sacrificed. In some cases it makes perfect sense to do it but in others, like for weight loss in relatively normal weight person, it's probably taking two steps back to take one step forward.
I say this based on a few people I'm aware of achieving a near underweight BMI but still having higher bodyfat. One woman kept fasting because she believed it would tighten up her abdominal skin through autophagy. Now she has very low muscle and is still overfat at 5'6" and 115 pounds.
There is no one size fits all. Based on what I am seeing in myself, I am convinced I hold too much glycogen and these 2 day fasts have helped reduce those reserves. Given most people have 500-600 g of glucose stored this way, gluconeogenesis would not be needed on intermediate length fasts of 1-3 days.
Given even at near zero carb intake I was unable to get BG below 100, but with a couple of 2 day fasts, I am getting readings 20-30 points lower, I have to think the needed glucose came from glycogen and not breakdown of muscle.
The improvement in the gym I have seen leads me to the same conclusion. Obviously this as n=1 and as I mentioned right at the beginning, there is no one size fits all. However, this may be something worth trying for others who have been unable to improve as much as they need to.3 -
Boy this sounds similar to me. I just started some 2 day fasts in the hope that helps with fasting blood sugar.1
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https://idmprogram.com/fasting-and-muscle-mass-fasting-part-14/
Dr Fung links to a number of studies while making his case there. I am not smart enough to be able to read through them all to tell if he's 100% correct on everything there or if he's skewing anything to push his agenda/program, but I know a lot of folks here like his work an awful lot.
I'm not sure where else to post this, so I'll just drop it in here... I've gone all in with fasting in the last month and feel really great about it. I did two "lets see how long I can go" fasts, one lasted five days, one lasted three, and am now working on implementing Alternate Daily Fasting as my permanent way of eating for the duration of my weight loss. In August there ended up being 10 days where I did not eat. In September I hope to continue ADF for the entire month and intend to have one more "fast as long as I can" period. I ended up losing about 13 pounds in August. I'm not expecting to get to my goal weight in 3 or 4 months or anything, but I am hoping that I get there a bit faster this way.
Of course everything I'm doing with fasting is from the perspective of someone with a lot of weight to lose and type 2 diabetes.2 -
https://idmprogram.com/fasting-and-muscle-mass-fasting-part-14/
Dr Fung links to a number of studies while making his case there. I am not smart enough to be able to read through them all to tell if he's 100% correct on everything there or if he's skewing anything to push his agenda/program, but I know a lot of folks here like his work an awful lot.
I'm not sure where else to post this, so I'll just drop it in here... I've gone all in with fasting in the last month and feel really great about it. I did two "lets see how long I can go" fasts, one lasted five days, one lasted three, and am now working on implementing Alternate Daily Fasting as my permanent way of eating for the duration of my weight loss. In August there ended up being 10 days where I did not eat. In September I hope to continue ADF for the entire month and intend to have one more "fast as long as I can" period. I ended up losing about 13 pounds in August. I'm not expecting to get to my goal weight in 3 or 4 months or anything, but I am hoping that I get there a bit faster this way.
Of course everything I'm doing with fasting is from the perspective of someone with a lot of weight to lose and type 2 diabetes.
Thanks for the link. So far, I have looked at 2 of the referenced studies. The increased HGH has been linked to a reduction in muscle breakdown during fasting. Like other studies I have seen, these were focused on obese patients. This is part of the reason I was hesitant about trying fasting since I am not obese or even overweight. If it wasn't for pre-diabetic blood sugars, I would appear to be in perfect health.
I just wasn't sure if the excess fat stores on an obese person would be a variable that would alter the outcome. In my n=1, I would say that even at 15-18% BF, there is enough fat stored to get similar results.
This study is good because it really shows that the elevated HGH that occurs during fasting seems to be the cause of the muscle sparing - http://diabetes.diabetesjournals.org/content/50/1/96.long2 -
cstehansen wrote: »Sunny_Bunny_ wrote: »cstehansen wrote: »Autophagy is not just for those with disease. It is a necessary process for everyone. Art De Vany and others have done some pretty interesting analysis of existing data showing the benefits of fasting for everyone. For some IF is enough. For some, longer fasts are needed.
The 130g commonly sited is based on the brain needing about 500 calories a day, so if ALL of it comes from glucose, that is about 130g. However, only about 1/4 of that MUST be glucose. 3/4 of that energy need can be fueled by ketones. When you knock that number down to 30-35, the amount from glycerol that is in every triglyceride that breaks down will make up a larger percentage than when you try to come up with 130.
Also, given that amino acids (protein) are continuously being broken down and recycled, and some of them are damaged and unable to be recycled, you will be losing that protein anyway. Why not use it instead of getting it from diet? This is actually one of the reasons fasting is associated with healthier mitochondria, slower aging and improved health is it helps the body get rid of these damaged materials.
I will say, I work out much harder than most people a decade or two younger than me and I did not reduce intensity or duration of workouts during either of these fasts. I did not feel any negative effects. In fact, the first workout after the first fast, I noticed I had to increase the weights being used to generate the same level of effort.
Tearing down of muscle for energy, from the medical research I can find, is more associated with eating in a hypocaloric manner (under eating) than it is with true fasting. If you have research showing otherwise, please share. I am never afraid of being wrong. I want to have the correct information.
I had avoided fasting (outside of IF just because I wasn't hungry) because being at healthy weight, without fatty liver and a relatively low body fat %, I could find no studies showing BG benefit for someone like me. All the studies centered on those who were obese or had fatty liver. It was only through frustration that I could not get my BG lower was I willing to give it a shot. Turns out I was wrong and fasting does seem to be helping me with my BG control.
I realize autophagy is for more than just disease treatment.
I just think it's misguided to suggest that muscle won't be sacrificed. In some cases it makes perfect sense to do it but in others, like for weight loss in relatively normal weight person, it's probably taking two steps back to take one step forward.
I say this based on a few people I'm aware of achieving a near underweight BMI but still having higher bodyfat. One woman kept fasting because she believed it would tighten up her abdominal skin through autophagy. Now she has very low muscle and is still overfat at 5'6" and 115 pounds.
There is no one size fits all. Based on what I am seeing in myself, I am convinced I hold too much glycogen and these 2 day fasts have helped reduce those reserves. Given most people have 500-600 g of glucose stored this way, gluconeogenesis would not be needed on intermediate length fasts of 1-3 days.
Given even at near zero carb intake I was unable to get BG below 100, but with a couple of 2 day fasts, I am getting readings 20-30 points lower, I have to think the needed glucose came from glycogen and not breakdown of muscle.
The improvement in the gym I have seen leads me to the same conclusion. Obviously this as n=1 and as I mentioned right at the beginning, there is no one size fits all. However, this may be something worth trying for others who have been unable to improve as much as they need to.
You might use stored liver glycogen during fasting but do you think the stores stay at that now reduced level until you break the fast or do you think glycogen use and replenishment through GNG are in constant flux to maintain a minimum level? So you'll be refilling stores through GNG.
I'm not saying don't fast. But GNG is happening. It has to. Its not going to wait until the fast is over to refill glycogen. It's definitely going to come from junk proteins and such but how much? I know of enough examples of people becoming skinny fat through extended fasting to think muscle wasting is a real threat. Now, I can say that the people I've spoken to through different groups that have had that problem didn't do any resistance training at all. On one hand I feel like that could be helpful but on the other I'm thinking it could be worse. I can't speak to that at all. I don't know anyone that's done extended fasting with exercise.
I guess keep us posted.1