My Results – Kraft Glucose Insulin Test


picture of test kit, blood spot cards and glucose bottle

This post is to report my results from taking the “Kraft Prediabetes Bloodspot Profile Test” from Meridian Valley Lab.


My actual test results

I took the 4 hour test at home on October 13th, 2015 and sent in the blood spot test cards to the lab in a pre-paid UPS mailer the lab provides as a part of the cost of the test.  The test requires 6, yes SIX, tests in which you have to poke your finger, or fingers and squeeze out FIVE large drops of blood on a card. The lab sent me back the results on Monday, November 2nd. Be forewarned, this test takes a long time and you have to get a LOT of Blood spots, 5 large blood spots per test!


the blood spot cards from the six tests, fasting, 1/2 hour, 1, 2, 3, and 4th hour

This is an information page that helps you understand the numbers, from Meridian Valley Lab.


As you can see, my insulin response was very low, which was a cause of concern to one of the doctors I consulted.

The first thing I want to make clear is this – I purposely did not Carb Load for two weeks before taking the test, as a person is recommended to do. Why? Because I want to know where I’m really at, with my real life habits. How do carbs effect me now, not after changing my diet for an extended time. Yes, I know this is not the correct way to get the test done, but believe me, I consulted with several doctor friends I have for an opinion about this before taking the test with this method.

First, I’m very pleased with my fasting insulin level, which was 3, anything below 10 is normal, but I’ve found below 5 is better.
I’ve also found in my not so scientific research (my own personal study of many studies), that fasting insulin seems to track with BMI, or waist circumference, see my graph about this below. This seems to be true in my case as well. I’m normal weight and my fasting insulin is certainly in the normal low range.


Fasting Insulin Directly Tracks with Body Fat – link from a Facebook post I did a while back.


My fasting sugar is also very good, 67 was that number. I expected to see a low number and I’m pleased with this result.

HIGH SUGAR in 2nd and 3rd Hour

My glucose numbers were much higher than I expected 170 in 1/2 hour, 203 in 1st hour and 149 in 3rd hour, even though I knew going in that they would be, because I didn’t carb load for a while before taking the test. Your body gets used to eating a certain way and doesn’t respond well to a sudden sugar challenge. The test said only the 3rd hour was high, but my doctor friends tell me the first hour should have been below 150, but my result was 203, that is a little concern to me, but I don’t give my body this level of high carb load regularly, so maybe it doesn’t matter.


The part that concerned one expert I consulted was my insulin response seems to be too low. Suggesting I probably have some loss of Beta Cell function. Unfortunately, I don’t have tests from the past that could tell me when this started. But it is very possible that I might have been diabetic before starting this diet, without actually knowing it. I’m fairly confident that the possibility of my being diabetic before losing weight is the case, it would be almost impossible to be 320 pounds and not have pre-diabetes as defined by Dr. Joseph Kraft, although there is a sub-set of people who are actually insulin sensitive even at a very high weight.

This insulin sensitive population will be a lucky minority of the over weight population.

insulin-sensitive obesity

It was recommended to me, by a doctor friend, to re-do this test after a period of carb loading to get an answer to the Beta Cell burnout question, but at this time I’m not going to do this, however, I will get regular A1c tests to keep an eye on my sugar control long term.

Looking at all this, I believe this diet was a blessing that ended up saving me from full blown out of control Type 2 Diabetes. I’m very thankful to God for guiding me to this way of life and helping me stay on this path. 

Below are some of the literature that Meridian Valley Lab sends with the test, to help you understand the results.
The cost of the test is a little over $200 dollars and it will probably take about 3 or more weeks to get your results back.


For a much better explanation of this test please watch Ivor Cummings video interview with Dr. Joseph Kraft.


Link to unedited Video of me taking test.
Too long and boring, but might interest some. It takes a lot of blood to do this test and it requires about 17 hours without food, which isn’t hard for me, but might be for you, if you’re not used to fasting, like I am.

I wrote the following on my Facebook page on Oct. 13th, 2015
Perspective on my Glucose/Insulin Test

I want to put a little perspective on the test I did this morning, because some of you are concerned I’m either doing something harmful to myself or that my test will not be accurate.

First, I want the test to be a true measure of where I am now, not something artificial that reflects how I would react if I carb loaded for several days. I want to know how my body reacts to a single carb load. What happens to my blood sugars for the four hours afterward? What happens to my insulin response after a carb load?

As I told you over a year ago when my video “Butter Makes Your Pants Fall Off” came out, now that I’m normal weight, I can and do eat a limited amount of whole food carbs, like potatoes. Since reaching normal weight, I DO NOT Feel good at zero carbs. That’s me, you are DIFFERENT, you have to do what I have done, forget the textbooks and expert opinions and ACTUALLY experiment on yourself to see what is good for you. What makes you feel good.

Now in saying that, let’s look at the test. It was 100 grams of dextrose (glucose) – pure carbohydrate. It wasn’t evil fructose that went to my liver. It was glucose, the sugar that every cell in my body can burn.

Next, I maintain a lower carb diet of somewhere around 50 to 75 grams of whole food carbs per day, every single day that I eat. So this 100 gram dextrose load is only a little more than I normally eat.

If you’re trying to lose weight, or if you are Type 2 diabetic, then MY LEVEL of carbs are probably not for you. You simply must find your own level by personal experimentation. If you think you can just follow someone else to health, you are mistaken. You have to learn from your own personal diet guru, which is your own body. It will tell you the answers, if you listen and obey.

Lastly, I’m mostly concerned with insulin. Chronically high insulin is the root of metabolic evil, I want to know if what I’m doing is working. In other words. I feel great doing what I’m doing, but what’s going on inside? I will soon know.

Check out some of my other interesting articles, here on this website:

Year in Review – this is a summary of my work with links

Butter Makes Your Pants Fall Off – article with the complete script to my video and lots of links to articles about this topics in that video.

Why Are Fat People Hungry? – article and video to answer the question of how a person who is very fat, with a lot of extra energy stored on their body, could still be hungry.

Fasting – If you want to know more about intermittent fasting, start here.

Bob’s High Fat, No Bean Chili Recipe

Lab Results – my actually lab results from the blood test I talk about in my Butter video.

Menu Planning – Simple, Boring, ‘Take a Chainsaw to you problem’, Menu Planning.

Looking for Inspiration? – Action Gives Birth to Hope

The scale is not your friend – That Lying, Cheating, No Good, Bubble Bursting, Dream Crushing Scale

Medicines That Keep You Fat

Butter in the Bible and other ancient cultures – Butter, Man’s Ancient Food

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  • Garry Lee says:

    I’m pretty sure that your glucose is high because your insulin response is low because you didn’t carbload for a few days beforehand. Your insulin apparatus is downgraded from lack of use! Keep not using it.


    • Bob Briggs says:

      I absolutely plan to keep it in hibernation for the rest of my life. Thanks Garry!! I want to be you when I grow up, LOL.

      • I don’t think carb loading will make a difference in Bob’s case. Carb loading usually improves insulin sensitivity not insulin production.

        Great that your sharing all this with us Bob.

        • Bob Briggs says:

          Thanks, Dr Gerber.
          I really appreciate all the great work you do too, the work you, Ivor and Ted have done getting Dr. Kraft’s ideas in the public mind will save lives for sure.

        • doc denis says:

          I want to get in touch with you, Dr Gerber. Check out the mail I sent to Bob at his briggs Gmail address about this comment . What do you mean about the low insulin result ?.
          I understand that it is just a normal result of eating LCHF that you PRODUCE less insulin.
          I understand if you eat carb loading for a couple of weeks the insulin comes right back.
          Don’t understand what you mean Dr, about carb loading changing insulin sensitivity and not changing the production ? Surely it was the LACK of CARBS which depressed insulin PRODUCTION leading to the flat type V curve in Kraft insulin tests ? I want to get in touch with you, Dr Gerber. Check out the mail I sent to Bob at his briggs Gmail address about this comment .

          What do you mean about the low insulin result ?.

          I understand that it is just a normal result of eating LCHF that you PRODUCE less insulin.

          I understand if you eat carb loading for a couple of weeks the insulin comes right back.

          Don’t understand what you mean Dr, about carb loading changing insulin sensitivity and not changing the production ? Surely it was the LACK of CARBS which depressed insulin PRODUCTION leading to the flat type V curve in Kraft insulin tests ?
          Hope to hear back from you , maybe we can have a telephone consultation.

    • Hey Bill, lets chip in $100 each and have Bob repeat the Kraft assay doing a prep as specified by you. I’m not sure Bob could prep for 4 weeks however.

      • doc denis says:

        Hi Dr Gerber
        Do you think for the Kraft test it’s best to do plasma or serum insulin ? I have to find a good endocrinologist and lab to do it my way,so I need to know what to instruct them. As you know many drs. never seem to have even heard of the Kraft test.

    • Bob Briggs says:

      The link you shared is exactly what I’ve been told by several people, but there’s no way I would do a test to find out for sure. However, I’ve also been told my insulin response was less than it should be, considering that I regularly, even daily eat at least 50 to 75 grams of carbs. My body should be used to an amount close to what the test gave me, 100 grams.
      But, the glucose actually made me a little sick and gave me a mild headache.

      Thanks for the fantastic and thought provoking work you do.

      • hubbs says:

        Bob, I had a similar test with a insulin response also similar to yours. Now my doctor and other experts want me to repeat this test after carb loading 150g/day for two weeks. I read your post and doctors’ comments a few times. I am trying to understand how meaningful it is for me to repeat the test with much longer carb loading time. It’s actually quite difficult for me to eat that much carb as I am small person eating about 1250cal/day. Last three days I started to eat buckwheat noodles barley lentil etc. for carbs, and my pp BG would stay up above 160 for hours, and fasting BG also above 105- 110.

        For last test, I did three days carb loading to 135g-150g/day, up from my 70g-100g/day diet of last month or two. I was given 75g glucose drink and had blood draw at fasting, 1, 2, 3hr. Fasting insulin was 1.3. Fasting glucose was 97, then 187@1hr, 113@2hr, 45@3hr.

        So I keep thinking about your choice of not carb loading for the test. And wonder what are the reasons many doctors think it is needed – to rule out pancreas cancer possibility? For treatment clarify? In my case I have hyper post meal reactive glycemic to just about any food except non-sweet veggies, nuts, egg/fish etc…

  • Bob Briggs says:

    I wouldn’t want to do that. No way I’d go a month at high carb just to see an answer on a blood test.
    I’m pleased with just knowing where I’m at now but will get an A1c periodically to watch sugar control.
    Thanks Jeff and Ray.


  • I reckon you just had physiological IR from low carb. If you had deficient insulin you would get the same feeling from your 50-75g carbs, and you wouldn’t have kept weight on before going low carb.
    I expect your normal carbs are fairly low-GI and spread out, unlike the GTT, and you don’t notice them and they don’t mess with your control. They may even be lower in digestible glucose than you think.

    • George, The pattern V here with Bob I suspect goes beyond physiologic insulin resistance. Bob is still producing enough insulin otherwise he would need insulin shots.

      Having done over 2000+ OGTT’s in my office we see this pattern V regardless of carb loading or not. I’ve been discussing with Catherine Crofts and was trying to get some input from Ken Sikaris. Catherine is considering a visit out to Colorado to help compile my clinical data.

    • celeste kelsey says:

      After living with a Type I Diabetic for the past 30 years, who has eaten a ketogenic diet for the past five years, I wholeheartedly concur with your comments. “As Dr. Bernstein says, if you want to know how a particular food affects the blood sugar…ask a Type I Diabetic.” My husband does not need to eat “a lot” of carbs to elevate his blood sugar – 10 carbs that he does not cover with insulin will do it. That is because his insulin is always low or non-existent. I am no expert…but after 30 years of marriage and monitoring my husband’s diet I have learned much. Reading post likes these helps immensely. Appreciate all the free information that real experts offer. 🙂

  • Bob Briggs says:

    I think you’re right about my diet George and hope you’re right about my beta cell function. I might never know though, because I have no intention to eat high carb long enough to properly test it.
    BTW, I love your writings, such thought provoking posts, you always make me think.


  • Amy says:

    Bob, you are a true hero! Thanks so much for sharing all of this incredibly helpful information with the rest of us.

  • Mick Cnovich says:

    Hard to answer this question. I am fasting for 16+ hours. I drink ACV in the am’s and then have coffee with coconut oil, walk on treadmill for 1.5 miles. I’ve been at this for about a month and half. My concern is that my blood sugars are still high.190’s -225’s and on med’s. Once in great while they’re down to 132 which showed me That I’m apparently going in the right direction. Weight is coming off. I started at 325 and am down to 304 which is great (not ideal) .I know you don’t have a crystal ball but when should I expect my Blood sugar to become lower? Eating a lot of bacon eggs,avocado, some walnuts.watching and eating low carb, in my case no carbs (bread pasta etc)other than negligible vegi foods.

  • Jesse says:

    Hi Bob,

    I agree with you. Btw, would you mind sharing your A1c number (s)? I always use A1c number and Insulin levels as markers of my progress. My current A1c is 7.4 but it is decreasing rapidly due to my LCHF woe. You help so many people with your knowledge, Bob……thank you!!

  • D.George says:

    Hi.. Thanks so much for all your postings.. May I ask you a question please. Can I drink all the water I want while fasting?

  • celeste kelsey says:

    I have to agree with you, Bob. Why bother to see your body’s response to high carbohydrate consumption if you are never going to eat that way??? Carb loading before the test might show that your insulin is still low indicating beta cell destruction…but what is the remedy for a a loss of beta cell production of insulin…a low carb diet. I also believe that keeping a close eye on glucose levels or HbA1c will inform you if that is the case. LADA or destruction of beta cells has symptoms and Bob is too savvy to miss them. Thanks for sharing Bob and for all of the “behind the scenes” work you put into this. 🙂

  • There is something you’re missing here. If you eat low-carb, your body will make less of the enzyme, Amylase, which breaks down carbs. It is made on an as needed basis, and if you aren’t eating many carbs, you’ll make less. This is why the carb loading is recommended, and why it is recommended to eat at least 150g for 72 hours before a glucose tolerance test. A non-diabetic will fail an OGTT if they have been eating low-carb as it takes about 72 hours to start making more of the enzyme.
    So if you suddenly eat carbs after eating low-carb, your blood glucose will spike. This does not mean you have a low insulin response or that there is beta cell damage or insulin resistance. It just means your amylase is low.

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