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Old 08-07-2017, 12:40 PM   #1
CEO of the House
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Questions regarding fasting blood glucose

Hello everyone, newbie here. I started keto diet 3 weeks ago. I don't like to eat sweets my whole life so cutting sweets is not a big problem for me. My diet before keto was pretty low fat/moderate carb/mod-high protein. Anyways, so far I haven't experience much of the keto flu (I tried to eat many veggies and all keto flu preventions so that might helped.) My question is this: My fasting blood glucose was 90 (taken in March and my diet hasn't change to keto until July) before I started keto, but now my fasting blood glucose is always above 105. I remember I read somewhere saying to get into ketosis the fasting blood glucose should be under 83, preferably between 55-75. My blood ketone levels are around 1-1.4. I just took the test (2hrs post-workout, still fasted) and my FBG is 79, and blood ketone level 1.4. So am I in ketosis? I'm also doing 18/6 or 16/8 IF, and I'm just concerned why my fasting blood glucose is higher since I started keto? Is this physiological insulin resistance? But I've only doing keto for 3 weeks. Will my fasting blood glucose getting higher and higher? How do I lower it down? Please help, thank you!
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Old 08-07-2017, 09:16 PM   #2
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Old 08-07-2017, 10:16 PM   #3
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Hello CEO!!

You may ask your question or find the information that you need on this thread/board here:


Or if that doesn't help, click on the search button and put in fasting blood glucose and several threads will pop up that may help, including the Fung style fasting chat thread and others.

You can also post this on one of the other boards, as there are a few boards that may be able to help you with the questions you have! (There are a lot of fasting threads in the JUDD forum)

I hope this helps!

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Old 08-08-2017, 05:38 AM   #4
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In keto many people experience a slightly higher than normal f.b.g. first thing in the morning. It is considered to be physiological insulin resistance or glucose sparing. It might be a bit early to experience this but everyone is different. If you have done keto for any length of time prior to this time, that would mean that your body is already good at burning fat as the main source of energy.

Basically, I wouldn't worry about it unless you start getting higher than normal a1c results. This is a measure of your glycation over a period of 3 months.
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Old 08-08-2017, 02:31 PM   #5
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Thank you for replying. I actually dig out my check-up numbers from past years after I posted the question here. What I found out is my FBG was all normal through out the years but most of them are one the higher side of the normal range. I didn't even pay attention when I took those tests because they all came back normal. Not until I started keto and began to measure my FBG levels that raised a flag for me.

My grandfather had diabetes and I think my dad is pre-diabetic. I know it's in my gene that's why I've always watched my diet (but was doing what I thought was right the low fat type before) I'm only 37 and so far my check-ups reports has all been on the "very healthy" side. But now I know my FBG is already higher than for example, my husband's which is 75. I will keep monitoring the numbers. Actually this morning my FBG is 86, and ketone level 1.2. At least it's lower than yesterday.

Thank you again for giving me directions to look into. I'll do more research on the links you listed above.

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