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it is about a week which is why you should eat enough to match your BMR once a week. This keeps your body from slowing down the metabolism to match caloric intake. If you go on such caloric deficits without resistance training, your metabolism will slow anyway because of muscle loss.
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If you go a week with really low caloric intake, your metabolism slows down to compensate which is what starvation mode is. In order to lose Fat, not Muscle, you should only run about a 500 calorie deficit per day and up you calories to break even one day per week. This regimen keeps your body from going into starvation…
