If they tough it out through the initial stage of keto flu, many people are rewarded with an improvement in overall energy levels, as well as an increased ability to focus. Once the brain switches from using glucose to ketones for fuel, energy and clarity get a boost. Ketones are an easy-to-use and powerful source of fuel for the brain, so it makes sense that once the brain becomes adept at using ketones rather than glucose, these benefits appear.

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