Why prioritize protein > fat> carbs?

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Fat and protein are required for hormone production and regulation and cell repair and maintenance. Carbs are necessary for optimum brain function, as dietary carbs help regulate serotonin and dopamine production.

Also, when your body is converting all the protein and fat you eat into glucose that it needs to function, you no longer have the protein and fat available for what they are needed for.

For survival? Carbs are nonessential. For optimal health? Carbs are essential.

When the body has a plentiful supply of carbs the brain will draw upon them (approx. 130g per day), but I have not seen any study to prove that the brain running on a mixture of Ketone, lactate and glucose (with ketone as the majority fuel) is any less optimal than glucose as the majority fuel.

If you have a study I would be genuinely interested in reading it!

Your body can only uptake so much protein and fat for structural maintenance. If you are eating adequate calories, I should think it unlikely you would be depriving your body of anything. But again this is hypothetical as most if not all will be eating carbs to some level.

Also by your analogy of carbs being essential - for optimal health. With this I agree, just as I would agree that bacon is an essential food group - for the ingredients to a bacon sandwich.

I'm a bit confused, as usual, by your post here. I remember once when you confessed to having "fuzzy brain" when you first went low-carb. You said not to worry--it goes away. Now I remember thinking at the time "it does?". Are you sure?

I'm sure.