Your body stores energy in three “cups”: the carb cup, the fat cup, and the muscle cup. When it needs energy, it first takes from the carb cup, but if that’s empty then it takes from the fat cup, and finally it will take from the muscle cup. The keto diet is designed to keep the carb cup empty so it has to take from the fat cup. A non-keto diet with similar calorie intake would add to the carb cup, which would then be taken from, so not as much would be used from the fat cup.
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