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by shlant
2166 days ago
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> ketones are much more efficient at crossing the blood brain barrier Source? > Ketosis is the default energy System, in that all things being equal when a person doesn’t introduce any food they naturally go into ketosis. People literally need to eat certain foods that spike insulin to get “kicked out” of ketosis. That is not a sound argument for it being the "default energy system". It makes much more sense that "default energy system" is that which directly provides the energy source REQUIRED by the brain[1]. Additionally, our closest ancestors (primates) were frugavorian omnivores. Ketosis is a state of starvation and the long term complications from it support that[2] but I guess starvation could be argued to be the "default state" of all living things. 1. https://www.ncbi.nlm.nih.gov/books/NBK28048/ 2. https://www.thepaleomom.com/adverse-reactions-to-ketogenic-d... |
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More interesting, however, is the fact that ketones can provide as much as 70% of the brain's energy needs, more efficiently than glucose. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3219306/
You are ignoring the most important part, humans don’t need outside sources of carbs/sugar (glucose) to power the brain, the body will produce the required glucose internally. So humans can live without carbs/sugar but the same can’t be said without fats.
And no ketosis is not a state of starvation, it’s not clear why you keep saying that, it’s a metabolic state that the body only gets thrown out of when insulin is spiked.
Again it is the default the body only gets knocked out of when introduced to certain foods in certain quantities, which would not have been available pre-ag.