Ketosis is a slow process. It is fast enogh to provide energy if you’re bed ridden but it’s not fast enough to maintain something like running. In a recent study I saw, looking at why athletes were not losing weight with restricted calories and high intensity activities, looking for the energy sources in those cases it was shown that in “emergencies” like that the body compensates by shutting down imune system functions and other energy consuming systems and uses the energy thise systems would be using. So in effect your BMR drops massively and you use far less energy than you would otherwise.
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