The Human Metabolic Response to Chronic Ketosis Without Caloric Restriction: Physical and Biochemical Adaptation

These findings indicate that the ketotic state induced by the EKD was well tolerated in lean subjects; nitrogen balance was regained after brief adaptation, serum lipids were not pathologically elevated, and blood glucose oxidation at rest was measurably reduced while the subjects remained euglycemic.

References:

Paoli (2012). "Nutrition and Acne: Therapeutic Potential of Ketogenic Diets." Skin Pharmacology and Physiology 25: 111-117.