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The very low-calorie ketogenic diet (VLCKD), characterized by a marked energy restriction that induces rapid weight loss, has recently been proposed as a valid nutritional strategy for managing obesity. VLCKD is commonly considered dangerous for the kidneys due to the misconception that it is high in protein, beyond the risk of electrolyte imbalances and an increase in diuresis. We report a case of safe and effective weight loss induced by VLCKD in a 43-year-old Caucasian woman with a recent episode of acute kidney injury on advanced chronic kidney disease. Surprisingly, we observed that after the diet-induced weight loss, not only did renal function not worsen, but proteinuria also improved. The principal value of this case report is its singular demonstration of impressive weight loss induced by VLCKD in a complex obese patient that was apparently not accompanied by the development of serious adverse sequelae.