Thanks guys.
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It's not your gut microbiome doing it. You have two types of mitochondria, those that specialize in burning glucose and those that specialize in burning fatty acids. If you've mostly run on carbs your whole life you'll have little of the later and it takes some time for your body to make more of them. Ketones from the liver are a signal to your cells to fire up that dormant molecular machinery hence why ketone production falls off after you become fat-adapted. Then you can maintain flexibility by alternating between carbs and fats to keep yourself in hybrid fuel mode.
I am not a doctor but, according to my search engine (!) we have only one type of mitochondria but they can run on different fuels depending upon circumstances. It said:
There is only one type….Alexa says 4 but can’t list them. Google said one.
OK, I am not an expert but I think if the general question is about "types of mitochondria" then there are several because they come in different shapes but if the question is "are there different mitochondria for different fuels" then I believe the answer is: no.
Good information. Thank you Hopefully the rest is accurate.