Ketones vs Glucose for Energy. Do Brains REALLY Prefer Ketones?

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Ketones vs Glucose for Energy. Do our brains really have a preference between glucose or ketones?

Ketones and Glucose can BOTH be used for energy but I’ll explain why our brains prefer one over the other. How do our brains use ketones and glucose? Watch now and learn the findings of a series of studies done with Alzheimer’s patients.

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The most common questions I get …

1) “Doc, what BLOOD METER do you recommend?”


For years my diabetics told me this system was great. I tried several others before I bought this one. I can’t count the number of times I have tested my blood only to get an ERROR message from the strip. Grrr. I hate that. FORACARE gets my vote because it is accurate and takes only ONE test strip to get the results. YES!!

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2) “Doc, which Ketones-In-A-Can (aka exogenous ketones, BHB) do you recommend?”

I don’t recommend these in everyone. I have times this is a great solution for my patients that are very overweight and trying to get used to burning ketones for fuel. All keto supplements should have magnesium in them. This one does.
I own the Dr Boz brand and the Dr Boz supplements.

3) “Doc, what can I have while fasting?”

Salt and water is the best.
The next best is a fasting tea. My favorite Pique Teas (also recommended by Jason Fung, MD):
Black coffee is okay during a fast.
Bone broth is alright.


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*This content is strictly the opinion of Annette Bosworth, MD and is for informational and educational purposes only. It is not intended to provide medical advice or to take the place of medical advice or treatment from a personal physician. All viewers of this content are advised to consult their doctors or qualified health professionals regarding specific health questions. Neither Dr. Bosworth nor the publisher of this content takes responsibility for possible health consequences of any person or persons reading or following the information in this educational content. All viewers of this content, especially those taking prescription or over-the-counter medications, should consult their physicians before beginning any nutrition, supplement or lifestyle program.


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23 thoughts on “Ketones vs Glucose for Energy. Do Brains REALLY Prefer Ketones?

  1. Dr. Boz, I'm loving your content. One suggestion: Create or edit out shorter 3:00–5:00 segments that contain the essential information on just one specific subject.

  2. I'd be careful with chicken wings.  Most times the sauces they come with are loaded with sugar.  On the other hand, I love low glycemic vegetables.  I cook them with a little butter.  They fill me up and they keep me regular.  Just sayin….

  3. 16:36 is the key message that needs to be reinforced as to "Why?" before you even move to the "adding ketones" phase. As you said, the bloodstream continues to provide adequate (and even excess) glucose for people with Alzheimer's, but their brain cells are no longer using it. This is the key point of Insulin Resistance that needs to be explained here. I like to compare a young healthy brain cell to a corn flake (yea, I know) and an aged Alzheimer's brain cell to a sugar frosted corn flake. I think that this analogy can be useful to help others visualize how new glucose may have a harder time making it through the sugar coating (glycation) on the brain cells and over time lead to Advanced Glycation End-products (AGE) effects.

  4. My mother has dementia and lives in a care home. Their meals are all extremely high carb, very low fat. I've attempted to tackle them on this but no joy yet. (I've no legal powers there.) She's put on many kilos but it's okay because 'Doc says she's not diabetic.' Is there something I can take her regularly that will help? Some MCT oil, perhaps? Thank you for all your amazing videos, I've just bought your book today!

  5. My glucose was 300+ a year ago, put myself on Keto against Dr's advise. I am now off of insulin and no inflammation!
    I still have fbs for 110 to 125 but I feel so much better. Now I need to work on getting over the fbs hump.

  6. Interesting excellent video.
    Another video I watched told me the the brain ? can survive with no glucose at all!! Doesn’t look like it, I’d say.
    I fast a lot and after 3 days my blood sugar gets very low (less than 3!)

  7. Great video dr Boz! Glad you put all the brains together, that was helpful..or leave a control brain beside changes would be super helpful. Sending this to my family xo

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