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During ketosis, many parts of your frame are burning ketones for electricity in preference to carbs. This includes a massive part of the mind.
However, this doesn't show up right away. It takes your frame and brain a while to "adapt" to burning fats and ketones as opposed to carbs.
During this version phase, you can enjoy a few temporary facet effects. These are normally referred to as the "low-carb flu" or "keto flu."